Chapter 9 Specification 9-10
■ VTG – Course over ground and ground speed
Version 1.5
$GPVTG, xxx.x,T,,,xxx.x,N,,<CR><LF>
1 2 3 4
Version 2.1
$GPVTG, xxx.x,T,,,xxx.x,N,xxx.x,K*hh<CR><LF>
1 2 3 4 5 6 8
Version 2.3 4.0、IEC61162-1
$GPVTG, xxx.x,T,,,xxx.x,N,xxx.x,K,a*hh<CR><LF>
1 2 3 4 5 6 7 8
1, 2 : Course over ground, degrees true
3, 4 : Speed over ground, knots
5, 6 : Speed over ground, km/h
7 : Mode Indicator (version 2.3, 4.0, IEC61162-1)
A = Autonomous mode
D = Differential mode
N = Data not valid
S = Simulator mode
P = SBAS mode (IEC61162-1 only)
8 : Checksum
■ ALR – Set alarm state
$VDALR, hhmmss.ss, xxx, A, A, c--c *hh<CR><LF>
1 2 3 4 5 6
1 : Time of alarm condition change, UTC
2 : Unique alarm number (identifier) at alarm source
3 : Alarm condition (A = threshold exceeded, V = not exceeded)
4 : Alarm’s acknowledge state, A = acknowledged, V = unacknowledged
5 : Alarm’s description text
6 : Checksum
■ ALF – Alert sentence
$VDALF,x,x,x,hhmmss.ss,a,a,a,aaa,x.x,x.x,x.x,x,c---c*hh <CR><LF>
1 2 3 4 5 6 7 8 9 10 1112 13 14
1 : Total number of ALF sentences for this message, 1 to 2
2 : Sentence number, 1 to 2
3 : Sequential message identifier, 0 to 9
4 : Time of last change
5 : Alert category, A, B or C
6 : Alert priority, E, A, W or C
7 : Alert state, A, S, N, O, U or V
8 : Manufacturer mnemonic code
9 : Alert identifier
10 : Alert instance, 1 to 999999
11 : Revision counter, 1 to 99
12 : Escalation counter, 0 to 9
13 : Alert text
14 : Chec
ksum
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