Chapter 9 Specification 9-14
■ VBW – Dual ground/water speed
$--VBW, x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11
1 : Longitudinal water speed, knots “-“ = astern
2 : Transverse water speed, knots “-“ = port
3 : Status: water speed, A = data valid, V = data invalid
4 : Longitudinal ground speed, knots “-“ = astern
5 : Transverse ground speed, knots “-“ = port
6 : Status: ground speed, A = data valid, V = data invalid
7 : Stern transverse water speed, knots “-“ = port
8 : Status: stern water speed, A = data valid, V = data invalid
9 : Stern transverse ground speed, “-“ = port
10 : Status: stern ground speed, A = data valid, V = data invalid
11 : Checksum
■ VLW – Dual ground/water distance
$--VLW, x.x,N,x.x,N,x.x,N,x.x,N*hh<CR><LF>
1 2 3 4 5
1 : Total cumulative water distance, nautical miles
2 : Water distance since reset, nautical miles
3 : Total cumulative ground distance, nautical miles
4 : Ground distance since reset, nautical miles
5 : Checksum
■ ACK – Acknowledge alarm
$--ACK, xxx*hh<CR><LF>
1 2
1 : Unique alarm number (identifier) at alarm source
2 : Checksum
■ ACN – Alarm command
$--ACN,hhmmss.ss,aaa,x.x,x.x,c,a*hh <CR><LF>
1 2 3 4 5 6 7
1 : Time
2 : Manufacturer mnemonic code
3 : Alert Identifier
4 : Alert Instance, 1 to 999999
5 : Alert command, A, Q, O or S
6 : Sentence status flag
7 : Checksum
■ DDC – Display dimming control
$--DDC,a, xx,a,a*hh<CR><LF>
1 2 3 4 5
1 : Display dimming preset
2 : Brightness percentage 00 to 99
3 : Color palette
4 : Sentence Status Flag
5 : Checksum
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