LA010812A © 2007 Navman Wireless. All rights reserved. Proprietary information and specifications subject to change without notice.
In the J21 the hour, minute, second portion within the ZDA message will look like this:
(for hour: 01, minute: 02, and seconds 10, 11, 12,…)
,010210.00,
,010211.00,
,010212.00,
In the J31 the following will be output for the hour, minute and second:
,010210,
,010211,
,010212,
Thus the J21 format simply appends the fixed string “.00” to the two digit seconds field.
NOTE:
With J31, the ZDA message format does not include the additional two digit fields as
described above.
6.2.4 VTG message
J31
J21
VTG
$GPVTG,309.6
2
,T,286,5
2
,M,0.13,N,0.20,
K,A*23
$GPVTG,309.6,T,286,5,M,0.13
0
,N,0.20
0
,
K,A*23
Table 6-5: VTG message comparison
NOTE: The J31 does not currently support Magnetic variation.
$GPVTG,26.96,T,,M,0.05,N,0.1,K*5F
6.2.5 RMC message
J31
J21
RMC
$GPRMC,161229,
487
,A,3723.2475,N,1215
8.3416,W,0.130,309.6
2
,120598,,E*10
$GPRMC,161229,A,3723.2475,N,12158.34
16,W,0.130,309.6,120598,
23.1
,E*10
Table 6-6: RMC message comparison
Note:
There is additional resolution in the time field:
,161229,
487
,
There is additional resolution in the Course over Ground field:
,309.6
2
,
Note:
The J31 does not support magnetic variation.
J31 output:
$GPRMC,133138.000,A,5133.2768,N,00150.4530,W,0.05,26.96,030907,,*20
6.2.6 GSA message
J31
J21
GSA
$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,
1.0,1.5*33
$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8
0
,1.0
0
,1.5
0
*33
Table 6-7: GSA message comparison
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