User's Manual

Table Of Contents
Sentence use reference
B-14 Appendix B: NMEA sentences 98-137573-A
B.2.29 TXT - Text transmission (output)
$--TXT,xx,xx,xx,c-c*hh<CR><LF>
B.2.30 VBW - Dual ground/water speed (input)
$--VBW,x.x,x.x,a,x.x,x.x,a,x.x,a,x.x,a*hh<CR><LF>
B.2.31 VDM - AIS VHF data-link message (output)
$--VDM,x,x,x,a,s-s,x*hh<CR><LF>
Field Data format Description Comment
1 TXT Sentence Id Used
2 xx Total number of sentences Used
3 xx Sentence number Used
4 xx Text identifier Used
5 c-c Text message Used
Field Data format Description Comment
1 VBW Sentence Id Used
2 x.x Longitudinal water speed Not Used
3 x.x Transverse water speed Not Used
4 a Status water speed, A = data valid, V = data invalid Not Used
5 x.x Longitudinal ground speed Used
6 x.x Transverse ground speed Used
7 A Status ground speed, A = data valid, V = data invalid Used
8 x.x Stern transverse water speed Not Used
9 A Status stern water speed, A = data valid, V = data invalid Not Used
10 x.x Stern transverse ground speed Not Used
11 A Status stern ground speed, stern ground speed Not Used
Field Data format Description Comment
1 VDM Sentence Id Used
2 x Total number of sentences needed to transfer message, 1 to 9 Used
3 x Sentence number, 1 to 9 Used
4 x Sequential message identifier, 0 to 9 Used
5 a AIS channel Used
6 s-s Encapsulated ITU-R M.1371 radio message Used
7 x Number of fill-bits Used