NMEA Data Mapping Overview

SWAY Breeze receives data from the onboard NMEA 2000 network and converts selected PGNs into standard NMEA 0183 sentences, which are transmitted live over WiFi (UDP/TCP).

All output depends on data available on the NMEA 2000 network.

NMEA 2000 → NMEA 0183 Mapping

The table below shows which NMEA 2000 PGNs are used as input and how they are converted into NMEA 0183 sentences.

NMEA 2000 PGN Data Used NMEA 0183 Output
129025 Latitude, Longitude RMC, GLL
129029 Latitude, Longitude, System Time RMC, GLL, ZDA
129793 System Time ZDA
126992 System Time ZDA
129026 SOG, Magnetic COG, True COG RMC, VTG
127250 Heading, Magnetic Variation HDG, VHW
127258 Magnetic Variation HDG, RMC
127245 Rudder Position RSA
128259 Speed Through Water VHW
128267 Depth, Depth Offset DPT, DBT / DBK / DBS
128275 Distance Log, Trip Distance VLW
130310 Water Temp, Air Temp, Pressure MTW
130306 Apparent & True Wind Data MWV (Apparent), MWV (True), MWD

Output sentences depend on availability and validity of source data.

AIS Data Conversion (NMEA 2000 → NMEA 0183)

When AIS data is present on the NMEA 2000 network, SWAY Breeze converts AIS PGNs into standard NMEA 0183 VDM sentences and forwards them over WiFi.

Supported AIS PGNs

NMEA 2000 PGN AIS Message Type NMEA 0183 Output
129038 AIS Class A Position Report VDM
129039 AIS Class B Position Report VDM
129041 AIS Aids to Navigation VDM
129794 AIS Static & Voyage Data VDM
129809 AIS Class B Static Data (Part A) VDM
129810 AIS Class B Static Data (Part B) VDM

NMEA 0183 Output over WiFi

SWAY Breeze transmits all NMEA 0183 data live over WiFi using both UDP and TCP. The data is broadcasted at 1 hz.

  • IP address: 192.168.4.1

  • UDP port: 10110

  • TCP port: 2001

Compatible with popular navigation and sailing apps that support NMEA 0183 over IP.

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