NavCom LAND-PAK Rev.N User Manual
Page 141
Technical Reference Manual Rev. N
Blk = All;
Blu = IOP w/Internal Radio
;
Red = IOP & LBM
;
Grn = Engine only
139
Ref
Message Field Description
Data
Type
Units
Range Scale
Byte
Count
…W32
13. Required DGPS message failure (NAV)
14. Navigation initialization NAN (NAV)
15. Navigation initialization fault (NAV)
16. Time initialization fault (NAV)
…
W33 Reserved
U08
1
CKSM Checksum
U08
1
ETX
03
(hex)
U08
1
Precise Lat/Lon can be computed by S32 + U04. Where S32 lsb is 2
-11
and U04 is 2
-15
.
SET refers to Solid Earth Tides. Positions with SET provide better vertical and horizontal
positioning accuracy, to account for gravitational effects placed on terrain from celestial
bodies (i.e. the Sun, Moon, etc.)
The 0xb1 record does not provide course over ground and velocity over ground.
The 0xb1 record provides velocity East and North. These must be converted
(calculated) externally to the receiver. However, the NMEA record VTG does
provide both course and speed (velocity) over ground calculations.