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Garmin NMEA 2000 Technical Reference
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Garmin NMEA 2000 Technical Reference

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TECHNICAL REFERENCE FOR GARMIN
NMEA 2000 Network Fundamentals
This technical reference provides basic NMEA 2000 component identification
page
2), basic NMEA 2000 network-building instructions
page
4), and a list of NMEA 2000 data that may be used by some Garmin NMEA 2000 certified devices
(General NMEA 2000 Data Types, page
What is NMEA 2000?
NMEA 2000 is a plug-and-play communications standard used for connecting marine sensors and display
devices within ships and boats, and is considered the successor to the NMEA
You can learn more about NMEA 2000 and purchase the NMEA 2000 standard documentation at
/content/STANDARDS/NMEA_2000.
Garmin uses NMEA 2000 micro connectors on devices, sensors, and T-connectors that are compatible with
other NMEA 2000 micro connectors, cables, and NMEA 2000 compatible devices.
September 2021
PRODUCTS
(NMEA 2000 Network Planning and Construction,
12).
NMEA 2000
®
(NMEA 2000 Components,
0183 serial data bus standard.
®
GUID-1415AAD0-FE63-42A6-8F8D-DB713D616122 v1
®
nmea.org

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Summary of Contents for Garmin NMEA 2000

  • Page 1 2), basic NMEA 2000 network-building instructions (NMEA 2000 Network Planning and Construction, page 4), and a list of NMEA 2000 data that may be used by some Garmin NMEA 2000 certified devices (General NMEA 2000 Data Types, page 12). What is NMEA 2000?
  • Page 2 (Network Termination, page 11). Female termi­ You must install terminators on both ends of the 010-11081-00 nator backbone. Connects the NMEA 2000 network to a 12 Vdc power source (Power Connection Considerations, page Power cable 010-11079-00 2 m (6.5 ft.) 3 A fuse included 010-11076-03: 0.3 m...
  • Page 3 LEN (Load Equivalency Number): A simplified value that represents the amount of current a device draws from the NMEA 2000 network. A LEN of 1 = 50 mA. Each device should have an LEN specified on the product or in...
  • Page 4 You must connect each NMEA 2000 device to the backbone using a T-connector. You must connect the NMEA 2000 backbone to a power source, and you must install terminators at both ends of the network for proper functionality.
  • Page 5 Sample NMEA 2000 Network NOTE: This diagram illustrates only the NMEA 2000 data connections to each device or sensor on the network. Some devices or sensors can be powered by the NMEA 2000 network, and others may require a separate power connection.
  • Page 6 Linear Backbone Construction The backbone is the main communication path of the NMEA 2000 network, so it is extremely important to construct the backbone properly. An improperly constructed backbone may prevent the network from functioning, or you may experience unexpected performance.
  • Page 7 When connecting the NMEA 2000 network to power, you must observe these considerations: • The dedicated NMEA 2000 power cable must connect to a 12 Vdc. Connecting to a 24 Vdc or any power source greater than 12 Vdc may damage the NMEA 2000 network components or devices.
  • Page 8 For the NMEA 2000 network to work properly there must not be more than a 1.67 Vdc drop in the supply voltage between the T-connector with the power cable and the NMEA 2000 device located farthest from this T- connector.
  • Page 9 When the voltage-drop formula is applied to this example, the voltage drop is greater than 1.67 Vdc. This NMEA 2000 network will not function correctly when powered at the end. to function correctly, this NMEA 2000 network must be redesigned with the power connected to the center of the network.

  • Page 10: Power Isolation

    Length = 6 m When the NMEA 2000 network is redesigned with the power source in the center, calculate the voltage drop in both directions. If the T-connector to which you connect the power source is connected directly to another T- connector (as shown in this example), use the LEN from the device connected to that T-connector as part of the calculation for both directions.

  • Page 11: Network Termination

    Backbone extension cable Male terminator If the final NMEA 2000 device on the NMEA 2000 network is separated from the backbone by a long length of backbone extension cable, and the typical T-connector/drop cable/terminator combination is not feasible or is too bulky for the area, you can use an in-line terminator instead of the final T-connector on the backbone.
  • Page 12 T-connectors at the ends of the network. • The total length of all drop cables cannot exceed 78 m (256 ft). • The maximum length of a single drop cable from the top of a T-connector to NMEA 2000 device is 6 m (20 ft).
  • Page 13 NMEA 2000 Engine Data Data Type PGN Data Required Typical Sender Battery voltage 127489: Dynamic engine parameters NMEA 2000 compatible engine Fuel flow rate 127489: Dynamic engine parameters Fuel flow sensor Hours 127489: Dynamic engine parameters NMEA 2000 compatible engine...
  • Page 14 NMEA 2000 Navigation Information Data Type PGN Data Required Typical Sender 129026: COG and SOG 129029: GNSS position data Course made good 129284: Nav data Garmin chartplotter and GPS antenna 129285: Navigation (route and waypoint) 129283: Cross track error 129026: COG/SOG...
  • Page 15 NMEA 2000 Trip Data Data Type PGN Data Required Typical Sender 129026: COG and SOG Odometer GPS antenna 129029: GNSS position data 129026: COG and SOG Trip odometer GPS antenna 129029: GNSS position data 129026: COG and SOG Average GPS speed...
  • Page 16 NMEA 2000 Weather Data Data Type PGN Data Required Typical Sender 130310 and 130311: Environmental parame­ ters (old) Barometer Barometric pressure sensor 130314: Actual pressure 130310 and 130311: Environmental parame­ ters (old) 130312: Temperature (old) Air temperature Air temperature sensor...
  • Page 17 Data Type PGN Data Required Typical Sender 130306: Wind data 127250: Vessel heading Cardinal wind direction A wind sensor, a water speed sensor, 128259: Water speed (less-accurate and a heading sensor 130306: Wind data 127250: Vessel heading 128259: Water speed A wind sensor, a water speed sensor, Beaufort scale 129026: COG/SOG...
  • Page 18 Wind VMG (less-accurate 129029: GNSS position Wind sensor and a GPS antenna 130306: Wind data Waypoint VMG 129284: Nav data Garmin chartplotter and a GPS antenna Maximum apparent wind speed 130306: Wind data Wind sensor 128259: Water speed Maximum true wind speed...
  • Page 19 NMEA 2000 System Data Data Type PGN Data Required Typical Sender 129026: COG/SOG Time of day GPS antenna 129029: GNSS position data 129026 - COG/SOG Date GPS antenna 129029 - GNSS position data © 2008 Garmin Ltd. or its subsidiaries...
  • Page 20 © 2008 Garmin Ltd. or its subsidiaries support.garmin.com...