GPS200

GPS Antenna/Receiver

 

User’s Manual

 

 

 

Revision 1.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Copyright © 2015 Maretron, LLP All Rights Reserved

 

Maretron, LLP

9014 N. 23rd Ave #10

Phoenix, AZ 85021

http://www.maretron.com

 

 

Maretron Manual Part #: M002501

Revision History

 

Revision

Description

1.0

Initial Revision

1.1

Corrected address in Section 7

1.2

Added prohibition of red Loctite threadlocking compound and cleaning agents containing acetone

1.3

Updated specifications to current GPS chipset revision

 


 

Table of Contents

 

1          Introduction.. 1

1.1      Firmware Revision.. 1

1.2      GPS200 Features. 1

2          Installation.. 1

2.1      Unpacking the Box. 1

2.2      Choosing a Mounting Location.. 1

2.3      Mounting the GPS200. 2

2.3.1    Mounting the GPS200 to a Horizontal Surface. 2

2.3.2    Mounting the GPS200 to a Standard Marine Pole Mount 3

2.4      Connecting the GPS200. 3

2.4.1    Checking Connections. 4

3          Operation.. 5

3.1      Magnetic Variation.. 5

4          Maintenance. 6

5          Troubleshooting. 7

6          Technical Specifications. 8

7          Technical Support 10

8          Installation Template. 11

9          Maretron (2 Year) Limited Warranty. 12

 

Table of Figures

 

Figure 1 – Mounting the GPS200 to a flat surface. 2

Figure 2 – Mounting the GPS200 to a Standard Marine Pole Mount 3

Figure 3 – GPS200 Interface Connector 4

Figure 4 – NMEA 2000® Connector Face Views. 4

Figure 5 – Horizontal Mounting Surface Template. 11

 

 

Table of Appendices

 

Appendix A – NMEA 2000 Interfacing............................................................................................... A1

 

 


 


1      Introduction

Congratulations on your purchase of the Maretron GPS200 GPS Antenna/Receiver.  Maretron has designed and built your GPS200 to the highest standards for years of reliable, dependable, and accurate service.

 

The Maretron GPS200 is designed to operate within the harsh demands of the marine environment.  However, no piece of marine electronic equipment can function properly unless installed and maintained in the correct manner.  Please read carefully and follow these instructions for installation and usage of the Maretron GPS200 in order to ensure optimal performance.

 

1.1   Firmware Revision

This manual corresponds to GPS200 firmware revision 1.0.1.

 

1.2      GPS200 Features

The Maretron GPS200 has the following features.

 

 

2      Installation

2.1      Unpacking the Box

When unpacking the box containing the Maretron GPS200, you should find the following items:

 

1 - GPS200 GPS Antenna/Receiver

1 - Pole Mount Base

3 - Mounting Screws and Lock Washers

1 - GPS200 User’s Manual

1 - Warranty Registration Card

 

If any of these items are missing or damaged, please contact Maretron.

 

2.2      Choosing a Mounting Location

The selection of a suitable mounting location is important for the optimal performance of the Maretron GPS200.  The mounting location and orientation of the GPS200 should be:

 

1.    Level with the earth’s horizontal plane – This gives the GPS200 antenna the optimal view of satellites from all directions.

2.    High Enough to have a clear view of the sky to the horizon in all directions unblocked by masts or antennas – The GPS200 provides the best readings when it has access to as many satellites as possible.

3.    As far as possible from VHF, satellite, or radar antennas – Radio frequency transmissions from these antennas can interfere with the proper reception of GPS satellite signals by the GPS200.

 

2.3      Mounting the GPS200

The Maretron GPS200 can be mounted directly on top of a horizontal surface (Section 2.3.1) or on top of a 1” 14 threads per inch standard marine pole mount (Section 2.3.2).

 

2.3.1      Mounting the GPS200 to a Horizontal Surface

Attach the GPS200 securely to the vessel using the included brass mounting screws and included lock washers or other fasteners as shown in Figure 1 (see mounting template in Section 8 for drill pattern). Do not use threadlocking compounds containing methacrylate ester, such as Loctite Red (271), as they will cause stress cracking of the plastic enclosure.

 

Figure 1 – Mounting the GPS200 to a flat surface

2.3.2     Mounting the GPS200 to a Standard Marine Pole Mount

Screw the included GPS200 antenna mount base to the standard marine mount.  Thread the NMEA 2000® cable through the standard marine mount and the antenna mount base from the bottom out through the top and connect it to the GPS200 unit (see Section 2.4 below).  Finally, attach the GPS200 to the antenna mount base using the included brass mounting screws and lock washers as shown in Figure 2. Do not use threadlocking compounds containing methacrylate ester, such as Loctite Red (271), as they will cause stress cracking of the plastic enclosure.

 

Figure 2 – Mounting the GPS200 to a Standard Marine Pole Mount

 

2.4      Connecting the GPS200

The Maretron GPS200 provides a connection to an NMEA 2000® interface through a connector that can be found on the bottom of the device (see Figure 3).

 

Figure 3 – GPS200 Interface Connector

The NMEA 2000® connector is a five pin male connector (see Figure 4). You connect the GPS200 to an NMEA 2000® network using a Maretron NMEA 2000® cable (or compatible cable) by connecting the female end of the cable to the GPS200 (note the key on the male connector and keyway on the female connector). Be sure the cable is connected securely and that the collar on the cable connector is tightened firmly. Connect the other end of the cable (male) to the NMEA 2000® network in the same manner. The GPS200 is designed such that you can plug or unplug it from an NMEA 2000® network while the power to the network is connected or disconnected. The cable should not hang on the GPS200 connector more than a few feet without some sort of strain relief. For example, you wouldn’t want several feet of cable hanging straight down within a mast without strain relieving the cable. Please follow recommended practices for installing NMEA 2000® network products.

Figure 4 – NMEA 2000® Connector Face Views

2.4.1     Checking Connections

Once the NMEA 2000® connection to the Maretron GPS200 has been completed, check to see that GPS information is being properly transmitted by observing an appropriate display. Refer to Section 5, “Troubleshooting”, if no GPS information appears.

 

3      Operation

As shipped from the factory, the GPS200 automatically provides position, time, SOG, COG, magnetic variation, and satellite information and requires no user configuration. However, some of the GPS200 parameters are user configurable as described below:

 

 

These parameters may be configured using a Maretron display (DSM250), or the parameters can be configured using a Maretron NMEA 2000®/USB gateway (USB100) and Maretron’s N2KAnalyzer software.

 

Users with direct access to the NMEA 2000® interface may configure these parameters directly through the NMEA 2000® interface.  Please refer to Appendix A for a description of the NMEA 2000® messages used to configure these parameters.

 

3.1      Magnetic Variation

Magnetic variation is the angular difference between the true meridian (great circle connecting the geographic poles) and the magnetic meridian (direction of the lines of magnetic flux). Magnetic variation has different values at different locations on the earth with most areas undergoing change to the magnetic variation over time.

The GPS200 indicates magnetic variation anywhere on Earth using the World Magnetic Model (WWM). It is important to understand that the WMM geomagnetic model only characterizes that portion of the Earth’s magnetic field that is generated in the Earth’s fluid outer core (the main magnetic field). The portions of the geomagnetic field generated by the Earth’s crust and upper mantle, and by the ionosphere and magnetosphere, are not represented in the WMM. Consequently, a magnetic sensor such as a compass or magnetometer may observe spatial and temporal magnetic anomalies when referenced to the WMM. In particular, certain local, regional, and temporal magnetic declination anomalies can exceed 10 degrees. Anomalies of this magnitude are not common but they do exist. Declination anomalies of the order of 3 or 4 degrees are not uncommon but are of small spatial extent and are relatively isolated.

On land, spatial anomalies are produced by mountain ranges, ore deposits, ground struck by lightning, geological faults, and cultural features such as trains, planes, tanks, railroad tracks, power lines, etc. The corresponding deviations are usually smaller at sea, and decrease with increasing altitude of an aircraft or spacecraft. In ocean areas, these anomalies occur most frequently along continental margins, near seamounts, and near ocean ridges, trenches, and fault zones, particularly those of volcanic origin. Ships and submarines are also sources of magnetic anomalies in the ocean.

However, from a global main field perspective, the declination (D), inclination (I), and grid variation (GV) RMS errors of WMM are estimated to be less than 1.0° at the Earth’s surface over the entire 5-year life span of the model. Also, the RMS errors at the Earth’s surface horizontal intensity (H), the vertical component (Z), and the total intensity (F) of WMM are estimated to be well below 200 nT over the entire 5-year life of the model. Thus, the WMM meets and exceeds the accuracy requirements detailed in MIL-W-89500 (Defense Mapping Agency, 1993) for the entire life span of the model. To learn more about the WWM, please visit http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml.

 

4      Maintenance

Regular maintenance is important to ensure continued proper operation of the Maretron GPS200.  Perform the following tasks periodically:

 

 


5      Troubleshooting

If you notice unexpected operation of the Maretron GPS200, follow the troubleshooting procedures in this section to remedy simple problems.

 

Symptom

Troubleshooting Procedure

No data output

Check the connections to the NMEA 2000® connector and tighten if necessary

 

Ensure that power is supplied to the connected NMEA 2000® cable

 

Ensure that the GPS200 has a clear view to the horizon in all directions

 

Ensure that no VHF, satellite, or radar antennas have been mounted near the GPS200

 

If these steps do not solve your problem, please contact Maretron Technical Support (refer to Section 7 for contact information).

 

Warning: There are no user-serviceable components inside the Maretron GPS200.  Opening the GPS200 will expose the sensitive electronic components to adverse environmental conditions that may render the unit inoperative. Please do not open the GPS200, as this will automatically void the warranty. If service is required, please return the unit to an authorized Maretron service location.


 

6      Technical Specifications

Specifications

Parameter

Value

Comment

Supported Positioning Systems

GPS, GLONASS

Simultaneously

Position Accuracy (Autonomous)

<3m

2D RMS

Position Accuracy (WAAS)

<2.5m

2D RMS (depends on accuracy of correction data)

Channels

99

33 Tracking, 99 Acquisition

Tracking Sensitivity

-161dBm

 

Position Update Rate

10 per Second

10 Hz Position Fix Calculation Rate

Speed Update Rate

10 per Second

 

Time Update Rate

1 per Second

 

Hot Start

1 Seconds

Start Within Hours of Last Power Down

Cold Start

33 Seconds

Start from Unknown Position

Satellite Based Augmentation System

WAAS

EGNOS

MSAS

GAGAN

North America

Europe

Asia

India

Altitude Limit

18000 m

 

Velocity Limit

515 m/sec

 

Battery Backup

Lithium (4-5 Days)

Holds Position for Hot Starts

 

Certifications

Parameter

Comment

NMEA 2000®

Level A

Maritime Navigation and Radiocommunication Equipment & Systems

Tested to IEC 60945

FCC and CE Mark

Electromagnetic Compatibility

 

NMEA 2000® Parameter Group Numbers (PGNs) - See Appendix A for Details

Description

PGN #

PGN Name

Default Rate

Periodic Data PGNs

126992

System Time

1 Time/Second

128259

Speed

Disabled

129025

Position, Rapid Update

5 Times/Second

129026

COG and SOG, Rapid Update

4 Times/Second

129029

GNSS Position Data

1 Time/Second

129539

GNSS DOPs

1 Time/Second

129540

GNSS Satellites in View

1 Time/Second

127258

Magnetic Variation

1 Time/Second

Response to Requested PGNs

126464

PGN List (Transmit and Receive)

N/A

126996

Product Information

N/A

126998

Configuration Information

N/A

129538

GNSS Control Status

N/A

129541

GPS Almanac Data

N/A

Protocol PGNs

059392

ISO Acknowledge

N/A

059904

ISO Request

N/A

060416

ISO Transport Protocol, Connection Management

N/A

060160

ISO Transport Protocol, Data Transfer

N/A

060928

ISO Address Claim

N/A

065240

ISO Address Command

N/A

126208

NMEA

N/A

 

Electrical

Parameter

Value

Comment

Operating Voltage

9 to 32 Volts

DC Voltage

Power Consumption

<100mA

Average Current Drain

Load Equivalence Number (LEN)

2

NMEA 2000® Spec. (1LEN = 50 mA)

Reverse Battery Protection

Yes

Indefinitely

Load Dump Protection

Yes

Energy Rated per SAE J1113

 

Mechanical

Parameter

Value

Comment

Size

4” Diameter x 1.65” Tall

Not Including Antenna Mount Base

Weight

6 oz.

Not Including Antenna Mount Base

Mounting

Deck or Pole

 

 

Environmental

Parameter

Value

IEC 60945 Classification

Exposed

Degree of Protection

IP67

Operating Temperature

-25°C to 55°C

Storage Temperature

-40°C to 70°C

Relative Humidity

93%RH @40° per IEC60945-8.2

Vibration

2-13.2Hz @ ±1mm, 13.2-100Hz @ 7m/s2 per IEC 60945-8.7

Rain and Spray

12.5mm Nozzle @ 100liters/min from 3m for 30min per IEC 60945-8.8

Solar Radiation

Ultraviolet B, A, Visible, and Infrared per IEC 60945-8.10

Corrosion (Salt Mist)

4 times 7days @ 40°C, 95%RH after 2 hour Salt Spray Per IEC 60945-8.12

Electromagnetic Emission

Conducted and Radiated Emission per IEC 60945-9

Electromagnetic Immunity

Conducted, Radiated, Supply, and ESD per IEC 60945-10

Safety Precautions

Dangerous Voltage, Electromagnetic Radio Frequency per IEC 60945-12


 

7      Technical Support

If you require technical support for Maretron products, you can reach us in one of the following ways:

 

                                               Telephone:     1-866-550-9100

                                                            Fax:     1-602-861-1777

                                                       E-mail:     support@maretron.com

                                    World Wide Web:     http://www.maretron.com

                                                           Mail:     Maretron, LLP
                                                                        Attn: Technical Support
                                                                        9014 N. 23rd Ave Suite 10
                                                                        Phoenix, AZ 85021 USA


8      Installation Template

Please check the dimensions before using the following diagram as a template for drilling the mounting holes; the printing process may have distorted the dimensions.

Figure 5 – Horizontal Mounting Surface Template


 

9      Maretron (2 Year) Limited Warranty

 

Maretron warrants the GPS200 to be free from defects in materials and workmanship for two (2) years from the date of original purchase. If within the applicable period any such products shall be proved to Maretron’s satisfaction to fail to meet the above limited warranty, such products shall be repaired or replaced at Maretron’s option. Purchaser's exclusive remedy and Maretron’s sole obligation hereunder, provided product is returned pursuant to the return requirements below, shall be limited to the repair or replacement, at Maretron’s option, of any product not meeting the above limited warranty and which is returned to Maretron; or if Maretron is unable to deliver a replacement that is free from defects in materials or workmanship, Purchaser’s payment for such product will be refunded. Maretron assumes no liability whatsoever for expenses of removing any defective product or part or for installing the repaired product or part or a replacement therefore or for any loss or damage to equipment in connection with which Maretron’s products or parts shall be used.  With respect to products not manufactured by Maretron, Maretron’s warranty obligation shall in all respects conform to and be limited to the warranty actually extended to Maretron by its supplier. The foregoing warranties shall not apply with respect to products subjected to negligence, misuse, misapplication, accident, damages by circumstances beyond Maretron’s control, to improper installation, operation, maintenance, or storage, or to other than normal use or service.

 

THE FOREGOING WARRANTIES ARE EXPRESSLY IN LIEU OF AND EXCLUDES ALL OTHER EXPRESS OR IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND OF FITNESS FOR A PARTICULAR PURPOSE.

 

Statements made by any person, including representatives of Maretron, which are inconsistent or in conflict with the terms of this Limited Warranty, shall not be binding upon Maretron unless reduced to writing and approved by an officer of Maretron.

 

IN NO CASE WILL MARETRON BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, DAMAGES FOR LOSS OF USE, LOSS OF ANTICIPATED PROFITS OR SAVINGS, OR ANY OTHER LOSS INCURRED BECAUSE OF INTERRUPTION OF SERVICE. IN NO EVENT SHALL MARETRON’S AGGREGATE LIABILITY EXCEED THE PURCHASE PRICE OF THE PRODUCT(S) INVOLVED.  MARETRON SHALL NOT BE SUBJECT TO ANY OTHER OBLIGATIONS OR LIABILITIES, WHETHER ARISING OUT OF BREACH OF CONTRACT OR WARRANTY, TORT (INCLUDING NEGLIGENCE), OR OTHER THEORIES OF LAW WITH RESPECT TO PRODUCTS SOLD OR SERVICES RENDERED BY MARETRON, OR ANY UNDERTAKINGS, ACTS OR OMISSIONS RELATING THERETO. 

 

Maretron does not warrant that the functions contained in any software programs or products will meet purchaser’s requirements or that the operation of the software programs or products will be uninterrupted or error free. Purchaser assumes responsibility for the selection of the software programs or products to achieve the intended results, and for the installation, use and results obtained from said programs or products. No specifications, samples, descriptions, or illustrations provided Maretron to Purchaser, whether directly, in trade literature, brochures or other documentation shall be construed as warranties of any kind, and any failure to conform with such specifications, samples, descriptions, or illustrations shall not constitute any breach of Maretron’s limited warranty.

 

Warranty Return Procedure:

To apply for warranty claims, contact Maretron or one of its dealers to describe the problem and determine the appropriate course of action. If a return is necessary, place the product in its original packaging together with proof of purchase and send to an Authorized Maretron Service Location. You are responsible for all shipping and insurance charges. Maretron will return the replaced or repaired product with all shipping and handling prepaid except for requests requiring expedited shipping (i.e. overnight shipments). Failure to follow this warranty return procedure could result in the product’s warranty becoming null and void.

 

Maretron reserves the right to modify or replace, at its sole discretion, without prior notification, the warranty listed above.  To obtain a copy of the then current warranty policy, please go to the following web page:

http://www.maretron.com/company/warranty.php


Appendix A – NMEA 2000® Interfacing

 

GPS200 NMEA 2000® Periodic Data Transmitted PGNs

 

PGN 126992 – System Time

The GPS200 uses this PGN to provide a regular transmission of UTC time and date and to provide synchronism for measurement data. The factory default for periodic transmission rate is once per second. The transmission of this PGN can be disabled or the transmission rate of this PGN can be changed (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).

Field 1:    SID – The sequence identifier field is used to tie related PGNs together. For example, the GPS200 will transmit identical SIDs for 126992 (System Time), 128259 (Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data), 129539 (GNSS DOPs), and 129540 (GNSS Satellites in View) to indicate that the readings are linked together (i.e., the data from each PGN was taken at the same time although they are reported at slightly different times).

           2:    Source – This field is used to indicate the type of time source, therefore this field always reads as 0 (GPS).

           3:    Reserved (4 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0xF (the GPS200 sets all reserved bits to a logic 1)

           4:    Date – This field is used to indicate the UTC Date in resolution of 1 day (the number of days since January 1, 1970).

           5:    Time – This field is used to indicate the UTC Time in resolution of 1x10-4 s (24 hour clock, 0.0000 = midnight).

 

PGN 127258 – Magnetic Variation

The GPS200 uses this PGN to provide a regular transmission of magnetic variation. The factory default for periodic transmission rate is once per second. The transmission of this PGN can be disabled or the transmission rate of this PGN can be changed (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).

Field 1:    SID – The sequence identifier field is used to tie related PGNs together. For example, the GPS200 will transmit identical SIDs for 126992 (System Time), 128259 (Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data), 129539 (GNSS DOPs), and 129540 (GNSS Satellites in View) to indicate that the readings are linked together (i.e., the data from each PGN was taken at the same time although they are reported at slightly different times).

           2:    Variation Source – The GPS200 uses the WMM2005 for variation, therefore this field always reads as 5 (WMM2005).

           3:    Reserved (4 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0xF (the GPS200 sets all reserved bits to a logic 1)

           4:    Age of Service (Date) – This field is used to indicate the UTC Date in resolution of 1 day (the number of days since January 1, 1970).

           5:    Variation – This field is used to indicate the magnetic variation where positive values represent Easterly and negative values represent Westerly variation.

 

PGN 129025 – Position, Rapid Update

The GPS200 uses this PGN to provide latitude and longitude referenced to WGS84. The factory default for periodic transmission rate is 10 times per second. The transmission of this PGN can be disabled or the transmission rate of this PGN can be changed (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).

Field   1:   Latitude – Latitude in 1x10-7 degrees ("-" = south, “+” = north)

            2:   Longitude – Longitude in 1x10-7 degrees ("-" = west, “+” = east)

 

PGN 129026 – COG and SOG, Rapid Update

The GPS200 uses this PGN to provide Course Over Ground (COG) and Speed Over Ground (SOG). The factory default for periodic transmission rate is four times per second. The transmission of this PGN can be disabled or the transmission rate of this PGN can be changed (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).

Field 1:    SID – The sequence identifier field is used to tie related PGNs together. For example, the GPS200 will transmit identical SIDs for 126992 (System Time), 128259 (Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data), 129539 (GNSS DOPs), and 129540 (GNSS Satellites in View) to indicate that the readings are linked together (i.e., the data from each PGN was taken at the same time although they are reported at slightly different times).

           2:    COG Reference – This field is used to indicate the direction reference of the course over ground. This field always reads as 0 (True, not magnetic).

           3:    Reserved (6 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0x3F (the GPS200 sets all reserved bits to a logic 1)

           4:    Course Over Ground – This field is used to indicate the course over ground (COG) in resolution of 1x10-4 radians.

           5:    Speed Over Ground – This field is used to indicate the speed over ground (SOG) in resolution of 1x10-2 m/s.

           6:    Reserved (16 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0xFFFF (the GPS200 sets all reserved bits to a logic 1)

 

PGN 129029 – GNSS Position Data

The GPS200 uses this PGN to convey a comprehensive set of Global Navigation Satellite System (GNSS) parameters, including position information. The factory default for periodic transmission rate is once per second. The transmission of this PGN can be disabled or the transmission rate of this PGN can be changed (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).

Field 1:    SID – The sequence identifier field is used to tie related PGNs together. For example, the GPS200 will transmit identical SIDs for 126992 (System Time), 128259 (Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data), 129539 (GNSS DOPs), and 129540 (GNSS Satellites in View) to indicate that the readings are linked together (i.e., the data from each PGN was taken at the same time although they are reported at slightly different times).

           2:    Position date –UTC Date in resolution of 1 day (The number of days since January 1, 1970).

           3:    Position time – UTC Time in resolution of 1x10-4 s (24 hour clock, 0.0000 = midnight).

           4:    Latitude – Latitude in 1x10-16 degrees ("-" = south, “+” = north)

           5:    Longitude – Longitude in 1x10-16 degrees ("-" = west, “+” = east)

           6:    Altitude – Altitude referenced to WGS-84 in (resolution of 1x10-6 m)

           7:    Type of System – This field is used to indicate type of GPS system. The GPS200 will show either 0 (GPS) or 3 (GPS+SBAS, factory default) dependent on whether the user has enabled SBAS.

           8:    Method, GNSS – This field is used to indicate the quality of GNSS information. The GPS200 indicates one of the following values: 0=no GPS, 1=GNSS fix, 2=DGNSS fix, 6=Estimated (dead reckoning).

           9:    Integrity – This field always contains a value of 0 (no integrity checking).

         10:    Reserved (6 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0x3F (the GPS200 sets all reserved bits to a logic 1)

         11:    Number of SVs – This field is used to indicate the number of satellites used in solution.

         12:    HDOP – This field is used to indicate the horizontal dilution of precision with a resolution of 1x10-2 (unitless).

         13:    PDOP – This field is used to indicate the positional dilution of precision with a resolution of 1x10-2 (unitless).

         14:    Geoidal Separation – This field is used to indicate the Geoidal Separation in resolution of 1x10-2 m.

         15:    Number of Reference Stations – This field always contains a value of 0

         16:    Reference Station Type "1" – This field always contains a value of 0xF (Null)

         17:    Reference Station ID "1" – This field always contains a value of 0xFFF (data not available)

         18:    Age of DGNSS Corrections "1" – This field always contains a value of 0xFFFF (data not available)

 

PGN 129539 – GNSS DOPs

The GPS200 uses this PGN to provide a single transmission containing GNSS status and dilution of precision components (DOP) that indicate the contribution of satellite geometry to the overall positioning error. There are three DOP parameters reported, horizontal (HDOP), Vertical (VDOP) and time (TDOP). The factory default for periodic transmission rate is once per second. The transmission of this PGN can be disabled or the transmission rate of this PGN can be changed (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).

Field 1:    SID – The sequence identifier field is used to tie related PGNs together. For example, the GPS200 will transmit identical SIDs for 126992 (System Time), 128259 (Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data), 129539 (GNSS DOPs), and 129540 (GNSS Satellites in View) to indicate that the readings are linked together (i.e., the data from each PGN was taken at the same time although they are reported at slightly different times).

           2:    Set Mode – This field is used to indicate the desired mode of operation: 0 = 1D. 1 = 2D, 2 = 3D, 3 = Auto (factory default), 4-5 = Reserved, 6 = Error, 7 = Null. The GPS200 will always return a value of 3 for this parameter.

           3:    Op Mode – This field is used to indicate the actual current mode of operation: 0 = 1D. 1 = 2D, 2 = 3D, 3 = Auto (factory default), 4-5 = Reserved, 6 = Error, 7 = Null.

           4:    Reserved (2 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0x3 (the GPS200 sets all reserved bits to a logic 1)

           5:    HDOP – This field is used to indicate the horizontal dilution of precision with a resolution of 1x10-2 (unitless).

           6:    VDOP – This field is used to indicate the vertical dilution of precision with a resolution of 1x10-2 (unitless).

           7:    TDOP – This field is used to indicate the time dilution of precision with a resolution of 1x10-2 (unitless).

 

PGN 129540 – GNSS Satellites in View

The GPS200 uses this PGN to provide the GNSS information on current satellites in view tagged by sequence ID. Information includes PRN, elevation, azimuth, and SNR. Field 4 defines the number of satellites. Fields 5 through 11 defines the satellite number and the information. Fields 5 through 11 are sequentially repeated for each satellite to be transmitted. The factory default for periodic transmission rate is once per second. The transmission of this PGN can be disabled or the transmission rate of this PGN can be changed (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).

Field 1:    SID – The sequence identifier field is used to tie related PGNs together. For example, the GPS200 will transmit identical SIDs for 126992 (System Time), 128259 (Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data), 129539 (GNSS DOPs), and 129540 (GNSS Satellites in View) to indicate that the readings are linked together (i.e., the data from each PGN was taken at the same time although they are reported at slightly different times).

           2:    Mode – This field always reads as 3 (Null), indicating that range residuals are used to calculate position, and not calculated after the position.

           3:    Reserved (6 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0x3F (the GPS200 sets all bits to a logic 1)

           4:    Number of SVs – This field is used to indicate the number of current satellites in view. Fields 5-11 are repeated the number of times specified by this field’s value.

           5:    PRN "1" – This field is used to indicate the Satellite ID Number of the satellite (1-32=GPS, 33-64=SBAS, 65-96=GLONASS).

           6:    Elevation "1" – This field is used to indicate the Elevation of the satellite.

           7:    Azimuth "1" – This field is used to indicate the Azimuth of the satellite.

           8:    SNR "1" – This field is used to indicate the Signal to Noise Ratio (SNR) of the satellite.

           9:    Range Residuals “1” – The GPS200 always sets this field to a value of 0x7FFFFFFF (data not available)

         10:    PRN Status "1" – This field is used to indicate the status of the first satellite in the list. (0=Not Tracked, 1=Tracked but not used in solution, 2=Used in solution without Differential corrections, 3=Differential Corrections available, 4=Tracked with Differential Corrections, 5=used with Differential Corrections)

         11:    Reserved (4 bits) – This field is reserved by NMEA; therefore, this field always contains a value of 0xF (the GPS200 sets all bits to a logic 1)

If Field 4 contains a value greater than one, then the group of fields 5 through 11 is repeated until this group appears the number of times indicated by the value of Field 4.

 

 

GPS200 NMEA 2000® Non-Periodic Data Transmitted PGNs

 

PGN 129538 – GNSS Control Status

The GPS200 uses this PGN to provide the GNSS common satellite receiver parameter status. GPS200 sends this PGN only when requested by PGN 059904 (ISO Request).

Field  1:    SV Elevation Mask – If the elevation of a satellite (angle above the horizon) is below this value, the GPS200 will not use that satellite in the solution. Units are 1x10-4 radians. The GPS200 always indicates “data not available” for this field, indicating that this parameter is not user configurable.

           2:    PDOP Mask – If the PDOP exceeds this value, the GPS200 will indicate “No GNSS fix” or “Dead Reckoning Mode” in PGN 129029. Units are 1x10-2 (unitless). The GPS200 always indicates “data not available” for this field, indicating that this parameter is not user configurable.

           3:    PDOP Switch – If the PDOP exceeds this value, a GPS receiver will switch from 3D to 2D mode. For the GPS200, this field always contains a value of 0x7FFF, indicating that the GPS200 will always attempt to operate in 3D mode. Units are 1x10-2 (unitless). The GPS200 always indicates “data not available” for this field, indicating that this parameter is not user configurable.

           4:    SNR Mask – If the SNR of a satellite is below this value, the GPS200 will not use that satellite in the solution. Units are 1x10-2 dB. The factory default is to use all available satellites. The GPS200 always indicates “data not available” for this field, indicating that this parameter is not user configurable.

           5:    GNSS Mode – This field is used to indicate the desired mode of operation: 0 = 1D, 1 = 2D, 2 = 3D, 3 = Auto (factory default), 4-5 = Reserved, 6 = Error, 7 = Null. The GPS200 always returns a value of 3 (Auto) for this parameter, which is not user configurable).

           6:    DGNSS Mode – This field is used to indicate the desired mode of operation of DGNSS (0=do not use SBAS, 1 and 3=Use SBAS when available). The factory default value for this field is 1 (use SBAS when available).

           7:    Position / Velocity Filter – This field always contains a value of 0x3, indicating that the GPS200 does not allow configuration of the position / velocity filter.

           8:    Max Correction Age – This field always contains a value of 0xFFFF, indicating that the GPS200 does not allow configuration of the maximum age of SBAS correction data to be used.

           9:    Antenna Altitude for 2D Mode – This field is used to indicate the antenna altitude for the GPS200 to use when operating in 2D mode in units of 1x10-2 m. The factory default for this field is 0.0 m, and is not user configurable.

         10:    Use Antenna Altitude for 2D Mode – This field is used to indicate whether the GPS200 will use Antenna Altitude (Field 9) when operating in 2D mode. The GPS200 returns a value of 1 for this parameter, indicating that it will always indicate an Antenna Altitude of 0.0m when operating in 2D mode. This field is not user programmable.

 

 

GPS200 NMEA 2000® Received PGNs

 

PGN 126208 – NMEA Command Group Function – GNSS Control Status

This will change the configuration of the GPS200.

 

Field  1:    Complex Command Group Function Code (8 bits) – set this field’s value to 0x01, which denotes a command PGN.

           2:    Commanded PGN (24 bits) – set this field’s value to 129538, which denotes the GNSS Control Status PGN.

           3:    Priority Setting (4 bits) – set this field’s value to 0x8, which indicates to leave priority settings unchanged.

           4:    Reserved (4 bits) – set this field’s value to 0xF, which is the value for a reserved field of this size.

           5:    Number of Pairs of Commanded Parameters to Follow (8 bits) – set this field’s value to the number of configurations to be changed.

           6:    Field number of first commanded parameter (8 bits).  Please refer to the table below for valid values for this field.

           7:    Value of first command parameter (size depends on the field number specified in field 6 of this PGN) – please refer to the description of PGN 129538 above for details.

 

Field Number of

Commanded Parameter

Name of Commanded Parameter

Size (Bytes)

5

6

GNSS Mode

DGNSS Mode

1

1

 

Fields 6 and 7 are repeated pair wise until all parameters to be modified have been specified.

 

PGN 126208 – NMEA Command Group Function – Maretron Proprietary Restart GPS Engine

This will force the GPS200 to restart its GPS engine without performing a full reset of the unit.

 

Field  1:    Complex Command Group Function Code (8 bits) – set this field’s value to 0x01, which denotes a command PGN

           2:    Commanded PGN (24 bits) – set this field’s value to 126720, which denotes the Maretron proprietary PGN

           3:    Priority Setting (4 bits) – set this field’s value to 0x8, which indicates to leave priority settings unchanged

           4:    Reserved (4 bits) – set this field’s value to 0xF, which is the value for a reserved field of this size

           5:    Number of Pairs of Commanded Parameters to Follow (8 bits) – set this field’s value to 0x4, indicating that four parameters will follow

           6:    Number of First Commanded Parameter (8 bits) – set this field’s value to 0x1

           7:    Maretron Vendor ID and Industry Code (16 bits) – set this field’s value to 0x9889

           8:    Number of Second Commanded Parameter (8 bits) – set this field’s value to 0x02

           9:    Product Code (16 bits) – set this field’s value to 0x6F0, which is the NMEA 2000® product code for the GPS200.

         10:    Number of Third Commanded Parameter (8 bits) – set this field’s value to 0x03

         11:    Software Code (16 bits) – set this field’s value to 0x0001, which is the identifier for this version of the Maretron proprietary protocol

         12:    Maretron Command (8 bits) – set this field’s value to 0x30, which will force the GPS Engine to restart as selected by the following field.

         13:    Restart mode (8 bits) – set this field’s value to select the restart mode, 0=Factory restart, 1=Cold start.

 

PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate

This PGN will enable or disable the periodic transmission of specific PGNs.

 

Field  1:    Complex Command Group Function Code (8 bits) – set this field’s value to 0x00, which denotes a request PGN

           2:    Requested PGN (24 bits) – set this field’s value to the corresponding PGN for which you wish to change the periodic rate.

           3:    Transmission Interval (32 bits) – set this field’s value to 0x0 to disable the periodic transmission of the PGN identified in field 2 above. Set this field’s value to 0xFFFFFFFE to restore periodic transmission of the PGN identified in field 2 at the default rate. Otherwise, program in the desired periodic rate to restore periodic transmission of the PGN identified in field 2 above at the desired rate. The resolution of this field is 1 millisecond.

           4:    Transmission Interval Offset (16 bits) – set this field’s value to 0xFFFF; all other values will cause the request to be rejected.

           5:    Number of Pairs of Commanded Parameters to Follow (8 bits) – set this field’s value to 0x0.