45
Translated SeaTalk datagrams
When the SeaTalk translation is enabled, the following datagrams are translated into NMEA sentences:
SeaTalk NMEA
Description
00
DBT
Depth below transducer
10
MWV
Wind angle, (10 and 11 combined)
11
MWV
Wind speed, (10 and 11 combined)
20
VHW
Speed through water, includes heading when
present
21
VLW
Trip mileage (21 and 22 combined)
22
VLW
Total mileage (21 and 22 combined)
23
MTW
Water temperature
25
VLW
Total and Trip mileage
26
VHW
Speed through water, includes heading when
present
27
MTW
Water temperature
50
---
GPS latitude, value stored
51
---
GPS longitude, value stored
52
---
GPS speed over ground, value stored
53
RMC
Course over ground. RMC sentence is
generated from stored values from other GPS
related datagrams.
54
---
GPS time, value stored
56
---
GPS date, value stored
58
---
GPS lat/long, values stored
89
HDG
Magnetic heading, including variation (99)
99
---
Magnetic variation, value stored
The table shows that not all datagrams result in an NMEA sentence. Some datagrams are only used to
retrieve data, which is combined with data from other datagrams to be able to create one NMEA
sentence.
When the SeaTalk translation is enabled with option 2 (the s parameter in the CF sentence is 2), unlisted
datagrams are translated into a proprietary NMEA sentence with the following format:
$PSMDST,aa,bb,cc,dd…*hh<CR><LF>
aa,bb,cc,dd… represent the hexadecimal value of the bytes from the received SeaTalk datagram.
