Simrad HS80 User manual

ENGLISH
HS80/HS80A
MX575C/MX575D
GPS Compass
Manual
navico.com/commercial

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Preface | HS80/HS80A/MX575C/MX575D User Manual
Preface
Disclaimer
As Navico is continuously improving this product, we retain the right to make changes to the
product at any time which may not be reflected in this version of the manual. Please contact
your nearest distributor if you require any further assistance.
It is the owner’s sole responsibility to install and use the equipment in a manner that will
not cause accidents, personal injury or property damage. The user of this product is solely
responsible for observing safe boating practices.
NAVICO HOLDING AS AND ITS SUBSIDIARIES, BRANCHES AND AFFILIATES DISCLAIM ALL
LIABILITY FOR ANY USE OF THIS PRODUCT IN A WAY THAT MAY CAUSE ACCIDENTS, DAMAGE
OR THAT MAY VIOLATE THE LAW.
Governing Language: This statement, any instruction manuals, user guides and other
information relating to the product (Documentation) may be translated to, or has been
translated from, another language (Translation). In the event of any conflict between any
Translation of the Documentation, the English language version of the Documentation will be
the official version of the Documentation.
This manual represents the product as at the time of printing. Navico Holding AS and its
subsidiaries, branches and affiliates reserve the right to make changes to specifications
without notice.
Compliance
The smart GPS compass systems complies with the following regulations:
- MX575C/HS80: Annex A.1 - 4.41 Transmitting heading device THD (GNSS method)
- Annex A.1 - 4.14 GPS equipment
Annex A.1 - 4.50 DGPS equipment
- MX575D/HS80A: Annex A.1 - 4.41 Transmitting heading device THD (GNSS method)
- Annex A.1 - 4.14 GPS equipment
Annex A.1 - 4.15 GLONASS equipment
- Annex A.1 - 4.50 DGPS equipment
Annex A.1 - 4.51 DGLONASS equipment
See also “Certifications”on page 32
For more information please refer to our website:
www.navico.com/commercial or www.simrad-yachting.com
The Wheelmark
The HS80 / MX575C systems are produced and tested in accordance with the European
Marine Equipment Directive 2010/68/EU, while the HS80A/MX575D systems are produced
and tested in accordance with the Marine Equipment Directive 96/98 EC as amended by
directive (EU) 2015/559. This means that the systems comply with the highest level of tests for
nonmilitary marine electronic navigation equipment existing today.
The Marine Equipment Directive for ships flying EU or EFTA flags, applies to all new ships, to
existing ships not previously carrying such equipment, and to ships having their equipment
replaced.
This means that all system components covered by annex A.1 must be type-approved
accordingly and must carry the Wheelmark, which is a symbol of conformity with the Marine
Equipment Directive.
Copyright
Copyright © 2016 Navico Holding AS.

2 | Preface | HS80/HS80A/MX575C/MX575D User Manual
Warranty
The warranty card is supplied as a separate document.
In case of any queries, refer to the our website:
www.navico.com/commercial or www.simrad-yachting.com
About this manual
This manual is a reference guide for installing and using the HS80/HS80A/MX575C/MX575D
GPS compass systems.
The latest available manual version can be downloaded from our web sites.
Important text that requires special attention from the reader is emphasized as follows:
¼Note: Used to draw the reader’s attention to a comment or some important information.
Warning: Used when it is necessary to warn personnel that they
should proceed carefully to prevent risk of injury and/or damage to
equipment/personnel.

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Preface | HS80/HS80A/MX575C/MX575D User Manual
Contents
4 Introduction
4 Overview
5 Parts list
6 Installation
6 Mounting location
8 Mounting orientation
9 Mounting options
15 Por ts
19 Powering the Smart GPS compass
20 Connecting the Smart GPS compass to external devices
21 Default parameters
22 Operation
22 GPS overview
22 GLONASS overview
23 Smart GPS compass overview
27 Common commands and messages
31 Technical specications
31 Specifications
32 Certifications
34 Output messages
41 Proprietary Input data messages
48 Troubleshooting
50 List of abbreviations
51 Wiring Diagrams
51 MX420 CDU to GPS compass interface diagram
51 MX510/MX512 to GPS compass interface diagram
52 GPS compass interface via MX510 junction Box
53 MX512 to GPS compass interface diagram via MX512 Junction Box
54 1PPS output
54 PC to GPS compass interface diagram
55 GPS compass connection to the MX61xJB junction box.
57 HS80/HS80A connection via the NMEA 2000 network

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Introduction | HS80/HS80A/MX575C/MX575D Manual
Introduction
Overview
The HS80/HS80A GPS Compass and the MX575C/MX575D DGPS Compass are based upon a
new generation GPS engine technology.
Figure 1-1: HS80/HS80A/MX575C/MX575D side view
¼Note: When referring to both the HS80/HS80A GPS Compass and the MX575C/MX575D
DGPS Compass this manual uses the term smart GPS Compass. When referring to either
product, this manual uses either HS80/HS80A or MX575C/MX575D, respectively.
The smart GPS compass is a complete GPS compass and positioning system in a single
enclosure that requires only one power/data cable connection. With its NMEA 2000/NMEA
0183 support and ease of installation, it is the perfect solution for marine applications.
The HS80/MX575C is an integrated system that houses the following:
- New GPS engine technology
- Two GPS antennas
- Beacon receiver and H-Field beacon antenna (MX575C/D only)
The HS80A/MX575D is an integrated system that houses the following:
- New GPS + GLONASS engine technology
- Two Dual-Frequency GPS/GLONASS antennas
- Beacon receiver and H-field beacon antenna (MX575D only)
Common items in all the GPS compass models are:
- Power supply
- Single axis gyro
- Tilt sensor on each axis (X and Y axes)
The gyro and tilt sensors are present in all models to improve system performance and to
provide backup heading information in the event that GPS heading is not available due to
signal blockage.
¼Note: The HS80/HS80A GPS Compass is identical to the MX575C/MX575D DGPS Compass
with the exception that it does not contain a DGPS beacon receiver and H-field antenna. If
you purchased the HS80/HS80A GPS Compass, disregard the sections of this manual that
discuss the beacon signal, receiver operation, and implications to installation relating to the
beacon signal.
The new GPS engine technology supports multiple RF front ends - enabling tighter coupling
of measurements from separate antennas for use in heading-based products. Users will
achieve excellent accuracy and stability due to the more accurate code phase measurements,
improved multipath mitigation, and fewer components.
The two smart GPS antennas are separated by 50 cm between their phase centers, resulting in
+/- 0.5° RMS heading performance. The smart GPS compass provides heading and positioning
updates of up to 20 Hz and delivers positioning accuracy of less than 1.0 m 95% of the time
when using differential GPS corrections from beacon (MX575C/MX575D only) or from Space
Based Augmentation Systems (SBAS).

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Introduction| HS80/HS80A/MX575C/MX575D Manual
The smart GPS compass also features the GPS’exclusive COAST™ technology that enables the
GPS receivers to utilize old differential GPS correction data for 40 minutes or more without
significantly affecting the positioning quality. The MX575C/MX575D is less likely to be
affected by differential signal outages due to signal blockages, weak signals, or interference
when using COAST.
Parts list
¼Note: The HS80/HS80A/MX575C/MX575D’s parts comply with IEC 60945 Section 4.4:
“exposed to the weather.”
The sections below list parts included in your HS80/HS80A kit and the MX575C/MX575D kit.
HS80/HS80A Parts list
Part Name Qty Part number
HS80 GPS Compass, or
HS80A GPS Compass
1
1
000-10938-001
000-11643-001
Serial-to-NMEA 2000 adapter 1 000-10941-001
Manual 1 988-10221-002
Kit containing the following:
• Clamp 1
• Screw 1
• Washer 1
Optional items
15 meter Power/data cable 000-10939-001
30 meter antenna cable 000-10940-001
MX575C/MX575D Parts list
Part Name Qty Part number
MX575C DGPS Compass, or
MX575D DGPS Compass
1
1
000-10747-001
000-11644-001
Power/data cable, 15 m 1 000-10939-001
Manual 1 988-10221-002
Kit containing the following:
• Clamp 1
• Screw 1
• Washer 1
Optional items
Serial-to-NMEA 2000 adapter 000-10941-001
30 meter antenna cable 000-10940-001

6 | Installation | HS80/HS80A/MX575C/MX575D UserManual
Installation
Mounting location
This section provides information on determining the best location for the Smart GPS compass.
GPS reception
When considering where to mount the Smart GPS compass, consider the following GPS
reception recommendations:
• Consider GPS reception, ensuring there is a clear view of the sky available to the Smart
GPS compass so the GPS satellites are not masked by obstructions that may reduce system
performance
• Since the Smart GPS compass computes a position based on the internal primary GPS antenna
element, mount the Smart GPS compass where you desire a position with respect to the
primary GPS antenna (located on the end opposite the recessed arrow on the underside of the
enclosure).
• Locate any transmitting antennas away from the GPS Compass by at least a few meters to
ensure tracking performance is not compromised, giving you the best performance possible
• Make sure there is enough cable length to route into the vessel to reach a breakout box or
terminal strip
• Do not locate the antenna where environmental conditions exceed those specified in
“Environmental”on page 32.
Beacon reception
When using the MX575C/MX575D internal beacon receiver as the correction source, consider
the possible mounting locations from the perspective of ambient noise within the beacon
band (300 KHz).
Keep the following in mind when deciding upon a location with respect to maximizing beacon
performance:
• Ensure that the antenna is as far as possible from all other equipment that emits electromagnetic
interference (EMI) such as DC motors, alternators, solenoids, radio transmitters, power cables,
display units, and other electronic devices.
• If you are installing the antenna on a vessel, mount the MX575C/MX575D considering
maintenance and accessibility. In addition, ensure that the antenna is not obscured by the
metal mast, guy wires or metal railings on the vessel.
• If radar(s) or INMARSAT system is present, mount the GPS Compass antenna outside the path
of the transmission beam.
The MX575C/MX575D’s internal beacon receiver calculates a signal-to-noise ratio (SNR),
measured in decibels (dB) that indicates the receiver’s performance. The SNR is the height of the
signal above the noise floor: the higher the SNR, the better your beacon receiver demodulates
the signal. The optimum antenna location will be a position where your average SNR is highest.
You should turn on all accessories that you intend to use during normal operation when
locating the best position for the antenna. By monitoring the SNR, you can determine the
optimum location with respect to beacon reception. The SNR is available in the GPS6 (Beacon
Status) screen of the MX CDU.
2

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Installation | HS80/HS80A/MX575C/MX575D User Manual
Environmental considerations
The Smart GPS compass is designed to withstand harsh environmental conditions; however,
adhere to the following limits when storing and using the GPS Compass:
• Operating temperature: -30°C to +70°C (-22°F to +158°F)
• Storage temperature: -40°C to +85°C (-40°F to +185°F)
• Humidity: 95% non-condensing
VHF interference
VHF interference from such devices as cellular phones and radio transmitters may interfere
with GPS operation. For example, if installing the Smart GPS compass near marine radios
consider the following:
• VHF marine radio working frequencies (Channels 1 to 28 and 84 to 88) range from 156.05 to
157.40 MHz. The GPS working center frequency is 1575.42 MHz. The bandwidth is +/- 2MHz to
+/- 10 MHz, which is dependent on the GPS antenna and receiver design
• VHF marine radios emit strong harmonics. The 10th harmonic of VHF radio, in some channels,
falls into the GPS working frequency band, which may cause the SNR of GPS to degrade
significantly
• The radiated harmonic signal strength of different brands/models varies.
• Follow VHF radio manufacturers’ recommendations on how to mount their radios and what
devices to keep a safe distance away.
• Handheld 5W VHF radios may not provide suitable filtering and may interfere with the Smart
GPS compass’s operation if too close.
Before installing the Smart GPS compass use the following diagram to ensure there are no
nearby devices that may cause VHF interference.
Use these minimum distances
to determine where to place
the Smart GPS compass
1.5 m radius at top
(minimum)
1.0 m radius at base (minimum)
VHF antenna
Figure 2-1: Smart GPS compass minimum distance from nearby VHF radios

8 | Installation | HS80/HS80A/MX575C/MX575D UserManual
Mounting orientation
The smart GPS compass outputs heading, pitch, and roll readings regardless of the orientation
of the antennas. However, the relation of the antennas to the boat’s axis determines whether
you will need to enter a heading, pitch, or roll bias. The primary antenna is used for positioning
and the primary and secondary antennas, working in conjunction, output heading, pitch, and
roll values.
¼Note: Regardless of which mounting orientation you use, the Smart GPS compass provides
the ability to output the heave of the vessel. This output is available via the $GPHEV message.
Parallel orientation
The most common installation is to orient the Smart GPS compass parallel to, and along the
centerline of, the axis of the boat. This provides a true heading. In this orientation:
• If you use a gyrocompass, you can enter a heading bias in the Smart GPS compass to calibrate
the physical heading to the true heading of the vessel.
• You may need to adjust the pitch/roll output to calibrate the measurement if the Vector is not
installed in a horizontal plane.
Perpendicular orientation
You can also install the antennas so they are oriented perpendicular to the centerline of the
boat’s axis. In this orientation:
• You will need to enter a heading bias of +90° if the primary antenna is on the starboard side of
the boat and -90° if the primary antenna is on the port side of the boat.
• You will need to configure the receiver to specify the GPS antennas are measuring the roll axis
using $JATT,ROLL,YES.
• You will need to enter a roll bias to properly output the pitch and roll values.
• You may need to adjust the pitch/roll output to calibrate the measurement if the Vector is not
installed in a horizontal plane.
Figure 2-2 and Figure 2-3 provide mounting orientation examples.
Recessed arrow located on
the bottom of the enclosure
Forward motion
Figure 2-2: Recommended orientation and resulting signs of HPR values

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Installation | HS80/HS80A/MX575C/MX575D User Manual
Recessed arrow located on
the bottom of the enclosure
Forward motion
Figure 2-3: Alternate orientation and resulting signs of HPR values
Smart GPS compass alignment
The top of the Smart GPS compass enclosure incorporates sight design features to help you
align the enclosure with respect to an important feature on your vessel.
To use the sights, center the small post on the opposite side of the enclosure from you, within
the channel made in the medallion located in the center of the enclosure top as shown in
Figure 2-4 and Figure 2-5. Alignment accuracy when looking through the long site (Figure 2-4)
is approximately +/- 1°, while alignment through the short site (Figure 2-5) is approximately
+/- 2.5°.
Figure 2-4: Long sight alignment Figure 2-5: Short sight alignment
If you have another accurate source of heading data on your vessel, such as a gyrocompass,
you may use its data to correct for a bias in Smart GPS compass alignment within the Smart
GPS compass software configuration. Alternatively, you can physically adjust the heading of
the Smart GPS compass so that it renders the correct heading measurement; however, adding
a software offset is an easier process.
Mounting options
The Smart GPS compass allows for two different mounting options: flush mount and pole
mount.
• Flush mount - The bottom of the Smart GPS compass contains eight M8-1.25 holes for flush
mounting the unit to a flat surface (see Figure 2-6). The eight holes comprise two sets of four
holes. The inner four holes are in the same location as the HS70, allowing you to use the Smart
GPS compass as a drop-in replacement. The outer four holes provide a wider mounting option.
• Pole mount - The bottom of the Smart GPS compass contains a mounting hole (1” thread, 0.9”
depth) for easy pole mounting. Hand tighten until snug (do not over tighten). The set screws
on the long sides of the base (see middle drawing in Figure 2-6) allow you to secure the Smart
GPS compass in place (3/16” Allen wrench not included).

10 | Installation | HS80/HS80A/MX575C/MX575D UserManual
Smart GPS compass dimensions
Figure 2-6 illustrates the physical dimensions of the Smart GPS compass.
Figure 2-6: HS80/HS80A/MX575C/MX575D Smart GPS compass dimensions

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Installation | HS80/HS80A/MX575C/MX575D User Manual
Power/Data cable considerations
Before mounting the Smart GPS compass consider the following regarding power/data cable
routing:
• Cable must reach an appropriate power source
• Cable may connect to a data storage device, computer, or other device that accepts GPS data
• Avoid running the cable in areas of excessive heat
• Keep cable away from corrosive chemicals
• Do not run the cable through door or window jams
• Keep cable away from rotating machinery
• Do not crimp or excessively bend the cable
• Avoid placing tension on the cable
• Remove unwanted slack from the cable at the Smart GPS compass end
• Secure along the cable route using plastic wraps.
Warning: Improperly installed cable near machinery can be
dangerous.
Mounting the Smart GPS compass
This section describes how to flush mount or pole mount the Smart GPS compass. Keep the
following in mind when planning your installation:
• SIMRAD does not supply mounting surface hardware or a mounting pole. You must supply
the appropriate hardware or mounting pole required to complete Smart GPS compass
installation.
• You do not necessarily need to orient the antenna precisely as you can enter a software offset
to accommodate for a heading measurement bias due to installation.
Flush mounting the Smart GPS compass
The bottom of the Smart GPS compass contains eight holes (two sets of four holes) for
flush mounting the unit to a flat surface (Figure 2-7). The flat surface may be something you
fabricate per your installation, an off-the-shelf item (such as a radar mounting plate), or an
existing surface on your vessel.
Figure 2-7: Flush mounting holes on bottom of Smart GPS compass
Complete the following steps to flush mount the Smart GPS compass:
1. Determine the desired location and proper orientation for the Smart GPS compass.
See “Mounting orientation”on page 8 for information on determining the desired
orientation.
2. Use the supplied template or photocopy the section of the Smart GPS compass that contains
the eight mounting holes (see Figure 2-7) for use as a template to plan the mounting hole
locations. Use the inner four holes or the outer four holes per your installation.
If using a photocopy make sure it is scaled one-to-one with the mounting holes on the
bottom of the Smart GPS compass.
3. Mark the mounting hole centers on the mounting surface.

12 | Installation | HS80/HS80A/MX575C/MX575D UserManual
4. Place the Smart GPS compass over the marks to ensure the planned hole centers align with the
true hole centers (adjusting as necessary).
5. Use a center punch to mark the hole centers.
6. Drill the mounting holes with a 9 mm bit appropriate for the surface.
7. Place the Smart GPS compass over the mounting holes and insert the mounting screws
through the bottom of the mounting surface into the Smart GPS compass.
Warning: When installing the Smart GPS compass, hand tighten only.
Damage resulting from over tightening is not covered by the warranty.
Pole mounting the Smart GPS compass
If you need the GPS-assisted roll measurement, install the Smart GPS compass perpendicular to
the vessel’s axis. If you do not need this measurement, install the Smart GPS compass parallel
with the vessel’s axis. For more information refer to Figure 2-2 on page 8 and Figure 2-3 on
page 9.
Complete the following steps to pole mount the Smart GPS compass:
1. Determine the desired location and proper orientation for the Smart GPS compass. See
“Mounting orientation”on page 8“ for information on determining the desired orientation.
2. Hand tighten the Smart GPS compass on the pole until snug (unit is stable on pole) while
ensuring correct orientation.
Warning: Hand tighten only. Damage resulting from over tightening
is not covered by the warranty.
3. Use the set screws on the long sides of the base (see Figure 2-6 on page 10) to secure the
Smart GPS compass in place (3/16” Allen wrench not included).

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Installation | HS80/HS80A/MX575C/MX575D User Manual
Connecting the serial cable or Serial-to-NMEA 2000 adapter to the Smart GPS
compass
After you mount the Smart GPS compass connect either the serial power/data cable or the
serial-to-NMEA 2000 adapter to the Smart GPS compass.
Connecting the serial Power/Data cable
1. Align the cable connector keyway with the Smart GPS compass connector key
Connect cable here
2. Rotate the cable ring clockwise until it locks. The Locking action is firm; you will feel a positive
“click” when it has locked.
Cable ring
Cable connector keyway Connector key
3. Attach the power/data cable to the cable clamp.
4. Fasten the clamp to the bottom of the Smart GPS compass using the screw and washer.
5. Attach the cable cover.

14 | Installation | HS80/HS80A/MX575C/MX575D UserManual
Connecting the Serial-to-NMEA 2000 adapter
For more information on the serial-to-NMEA 2000 adapter see “NMEA 2000 port” on page 16.
This adapter is an optional item for the MX575C/MX575D model.
1. Align the adapter connector keyway with the Smart GPS compass connector key.
Connect adapter
here
2. Rotate the cable ring clockwise until it locks. The locking action is firm; you will feel a positive
“click” when it has locked.
Cable ring
Cable connector keyway Connector key
3. Fasten the adapter to the body of the Smart GPS compass using the provided screws and the
two slots in the adapter.
4. Attach the cable cover.

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Installation | HS80/HS80A/MX575C/MX575D User Manual
Ports
The Smart GPS compass offers either NMEA 0183 serial port or NMEA 2000 port functionality.
Serial ports
The Smart GPS compass has three ports (Port A, Port B, and Port C), where:
• Port A can be both full-duplex RS-232 and half-duplex RS-422 (transmit only)
• Port B is full-duplex RS-422
• Port C is for NMEA 2000 and only available via serial-to-NMEA 2000 adapter
You can receive external differential corrections via either Port A (full-duplex RS-232) or Port
B (full-duplex RS-422). You can connect up to three devices at one time using two ports. One
device can receive data via Port A (RS-422 transmit only) while two devices can transmit and
receive data via Ports A and B (one connected to Port A RS-
232 and one connected to Port B).
¼Notes:
1. Port A (RS-422) or Port B is required for communicating to an IMO type-approved device.
2. You can update firmware via Port A (RS-232) or Port B.
¼Note: The MX575C/MX575D has maximum baud rate of 38400. Higher baud rates may impair
beacon signal tracking.
Serial port conguration
You may configure Port A or Port B of the GPS receiver to output any combination of data. Port
A can have a different configuration from Port B in terms of data message output, data rates,
and the baud rate of the port. This allows you to configure the ports independently based upon
your needs.
For example, if you want one generalized port and one heading-only port, you can configure
the ports as follows:
• Port A to have GPGGA, GPVTG, GPGSV, GPZDA, and GPHDT all output at 1 Hz over a 9600 baud
rate.
• Port B for GPHDT and GPROT message output at their maximum rate of 20
Hz over a 19200 baud rate.
The messages you configure each port to output and the rate of the port will be the same
for both RS-232 and RS-422 interface levels. For example, the RS-232 Port A and RS-422 Port A
output the same data messages at the same baud rate. If the baud rate or messages for the RS-
422 port need to be changed, this needs to be commanded through the RS-232 port.
Both RS-232 and RS-422 output signals may be used simultaneously.
¼Note: When the smart GPS compass is connected to Port 3 & 4 of the MX line of CDUs (MX420,
MX51x and MX61xJB), the MX unit sends a setup command that configures the smart GPS
compass to adjust to 19,200 baud and turns on only the required NMEA sentences.
Selecting Baud rates and message types
When selecting your baud rate and message types use the following formula to calculate
the bits/sec for each message and then sum the results to determine the baud rate for your
required data throughput.
Message output rate * Message length (bytes) * bits in byte = Bits/second
(1 character = 1 byte, 8 bits = 1 byte, use 10 bits/byte to account for overhead)
See “Common commands and messages”on page 27 for an example of this calculation.

16 | Installation | HS80/HS80A/MX575C/MX575D UserManual
Recommendations for connecting to other devices
When interfacing to other devices, ensure the transmit data output from the Smart GPS
compass is connected to the data input of the other device. The signal grounds must also be
connected.
Since RS-422 is a balanced signal with positive and negative signals referenced to ground,
ensure you maintain the correct polarity. For example, when connecting the transmit data
output positive signal to the receive line of the other device, it should be connected to the
receive positive terminal. The negative transmit data signal from the Smart GPS compass is
then connected to the receive data negative input of the other device.
There is likely little reason to connect the receive data input of the Smart GPS compass to
another device unless it is able to send configuration commands to the Smart GPS compass.
Since the Smart GPS compass uses proprietary NMEA 0183 commands for control over its
configuration, the vast majority of electronics will not be able to configure its settings unless
the other device has a terminal setting where you can manually issue commands.
NMEA 2000 port
To use the HS80/HS80A for NMEA 2000 interface, you need to use the Serial-to-NMEA 2000
adapter (P/N 710-0113-000#, see Figure 2-8). This adapter is optional item for the MX575C/
MX575D model. Insert the 18-pin connector of the adapter into the male end of the 18-pin
connector on the HS80/HS80A by aligning the keys. You can then attach the adapter to the unit
using the supplied screws (machine, 8-32, ½”, PPHC, SS) and washer (washer, flat, #8, SS). The
5-pin male Micro-C connector connects to your NMEA 2000 drop cable.
Micro-C connector 18-pin Female
connector
Figure 2-8: Serial-to-NMEA 2000 adapter
The MX575C/MX575D DGPS compass model is supplied with 15 meter interface cable for
NMEA 0183 interface connection. An optional 30-meter NMEA 0183 interface cable can be
ordered separately. The NMEA 2000 interface adapter is another option for the MX575C/
MX575D.
¼Note: The serial-to-NMEA 2000 adapter is not an IMO requirement and may not be used in
such an application.
The next section shows the requested PGNs with the Smart GPS compass in NMEA 2000
mode.

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Received messages based on a request
PG No.
(PGN) Description Level Default Update Rate (msec)
Freq
(Hz)
059392 ISO Acknowledgement
Used to acknowledge the status of certain
requests addressed to a specific ECU.
B On Request On
Request
059904 ISO Request
Request the transmission of a specific PGN,
addressed or broadcast.
B On Request On
Request
060928 ISO Address Claim
Used to identify to other ECUs the address
claimed by an ECU.
B On Request On
Request
126996 Product Information
NMEA 2000 database version supported,
manufacturer’s product code, NMEA
2000 certification level, Load Equivalency
number, and other product- specific
information.
B On Request On
Request
126464 Receive/Transmit PGNs group function
The Transmit / Receive PGN List Group
type of function is defined by first field.
The message will be a Transmit or Receive
PGN List group function.
B On Request On
Request
129538 GNSS Control Status
GNSS common satellite receiver parameter
status.
B On Request On
Request
129545 GNSS RAIM Output
Used to provide the output from a GNSS
receiver’s Receiver Autonomous Integrity
Monitoring (RAIM) process. The Integrity
field value is based on the parameters set
in PGN 129546 GNSS RAIM Settings.
B On Request On
Request
129546 GNSS RAIM Settings
Used to report the control parameters for
a GNSS Receiver Autonomous Integrity
Monitoring (RAIM) process.
B On Request On
Request
The next section shows the transmitted PGNs with their default update rate with the Smart
GPS compass in NMEA 2000 mode.
Transmitted messages
PG No.
(PGN) Description Level Default Update Rate (msec)
Freq
(Hz)
126992 System Time
The purpose of this PGN is twofold: To
provide a regular transmission of UTC
time and date. To provide synchronism for
measurement data.
B 1000 1
127250 Vessel Heading
Heading sensor value with a flag for True or
Magnetic. If the sensor value is Magnetic,
the deviation field can be used to produce
a Magnetic heading, and the variation
field can be used to correct the Magnetic
heading to produce a True heading.
B 100 10

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PG No.
(PGN) Description Level Default Update Rate (msec)
Freq
(Hz)
127251 Rate of Turn
Rate of change of the Heading.
B 100 10
127257 Attitude
Provides a single transmission that
describes the position of a vessel relative
to both horizontal and vertical planes.
This would typically be used for vessel
stabilization, vessel control and onboard
platform stabilization.
B 1000 1
127258 Magnetic Variation
Message for transmitting variation. The
message contains a sequence number to
allow synchronization of other messages
such as Heading or Course over Ground.
The quality of service and age of service
are provided to enable recipients to
determine an appropriate level of service if
multiple transmissions exist.
1000 1
129025 Position, Rapid Update
Provides latitude and longitude referenced
to WGS84. Being defined as single frame
message, as opposed to other PGNs that
include latitude and longitude and are
defined as fast or multi- packet, this PGN
lends itself to being transmitted more
frequently without using up excessive
bandwidth on the bus for the benefit of
receiving equipment that may require
rapid position updates.
B 100 10
129026 COG & SOG, Rapid Update
Single frame PGN that provides Course
Over Ground (COG) and Speed Over
Ground (SOG).
B 250 4
129027 Position Delta, High Precision Rapid Update
The “Position Delta, High Precision Rapid
Update” Parameter Group is intended for
applications where very high precision
and very fast update rates are needed for
position data. This PGN can provide delta
position changes down to 1 mm with a
delta time period accurate to 5 msec.
B 100 10
129028 Altitude Delta, High Precision Rapid Update
The “Altitude Delta, High Precision Rapid
Update” Parameter Group is intended for
applications where very high precision
and very fast update rates are needed for
altitude and course over ground data.
This PG can provide delta altitude changes
down to 1 millimeter, a change in direction
as small as 0.0057°, and with a delta time
period accurate to 5 msec.
B 100 10
129029 GNSS Position Data
Conveys a comprehensive set of Global
Navigation Satellite System (GNSS)
parameters, including position information.
B 1000 1