Appendix 2-6
DTM - Datum reference
Version 2.1, 2.3 only
$GPDTM, ccc,,x.x,a,x.x,a,ux.x,ccc*hh<CR><LF>
1 2 3 4 5 6 7 8
1: Local datum
W84 = WGS84
W72 = WGS72
IHO = datum code (Version 2.1: JRC proprietary value)
IHO = datum code (Version 2.3: IHO datum code)
2, 3: Lat offset, min, N/S (see Note)
4, 5: Lon offset, min, E/W (see Note)
6: Altitude offset, m (see Note)
7: Reference datum, W84 = WGS84
8: Checksum
Note Latitude and longitude offsets are positive numbers, the altitude offset may be negative.
Offsets change with position: position in the local datum is offset from the position in the
reference datum in the directions indicated:
P
local datum = Pref datum + offset
GSA - GNSS DOP and active satellites
Version 2.1 only
$GPGSA, a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx.x,xx.x,xx.x*hh<CR><LF>
1 2
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Version 2.3 only
$GPGSA, a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx.x,xx.x,xx.x*hh<CR><LF>
1 2
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Version 2.3 only
$GPGSA, a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx.x,xx.x,xx.x,1*hh<CR><LF>
1 2
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
1: Mode
M = manual, forced to operate in 2D or 3D mode
A = automatic, allowed to automatically switch 2D/3D
2: Positioning dimensions
1 = fix not available
2 = 2D
3 = 3D
3 - 14: ID numbers of satellites used in solution
(For less than 12 satellites, the field are "00".) (Version 2.1)
15: PDOP (4 digit fixed length) (Version 2.1)
16: HDOP (4 digit fixed length) (Version 2.1)
17: VDOP (4 digit fixed length) (Version 2.1)
18: Checksum (Version 2.1)
3 - 14: ID numbers of satellites used in solution
(For less than 12 satellites, the fields are NULL.) (Version 2.3, IEC)
SBAS satellites 120 to 138 are represented by 33 to 51.
33 to 64 are reserved for SBAS satellite use.
If there are 12 or more GPS satellites when positioning, even if
there are SBAS satellites, the output gives priority to GPS.
15: PDOP (4 digit fixed length) (Version 2.3, IEC)
16: HDOP (4 digit fixed length) (Version 2.3, IEC)
17: VDOP (4 digit fixed length) (Version 2.3, IEC)
18: Checksum (Version 2.3)
18: GNSS System ID 1: fixed
19: Checksum
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