Course Over Ground And Ground Speed (Vtg) - Navman 12 Designer's Manual

3.6.1.8 Course over ground and ground speed
(VTG).
This message contains the course over ground
(true and magnetic) and speed relative to the
ground. The contents of the 'VTG' message are
Message ID: VTG (while receiver is in navigation mode -- Note 1)
Rate: Variable
Fields: 8
Field No. Symbol
$__VTG
1 TRU_CRS
2 T
3 MAG_CRS
4 M
5 SPD_N
6 N
7 SPD_K
8 K
CKSUM
<CR><LF>
Note 1: Output of this message is temporarily suppressed while the receiver is in acquisition mode.
Table 3-52. VTG message (course over ground and ground speed)
MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.
Field description
Start of sentence and address field
Course over ground, degrees true
True course indicator
Course over ground, degrees magnetic
Magnetic course indicator
Speed over the ground (knots)
Nautical speed indicator (N = knots)
Speed (km)
Speed indicator (K = km/hr)
Checksum
Sentence terminator
described in Table 3-52.
Sample message:
$GPVTG,291.3,T,277.3,M,0.784,N,1.452,K*4F
Field type Example
$GPVTG
x.x 291.3
t T
x.x 277.3
m M
x.x 0.784
n N
x.x 1.452
k K
*hh *4F
<CR><LF>
53