JRC JLR-20 Instruction Manual page 105

■ 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
1: Datum symbol
W84 - WGS84
W72 - WGS72
IHO - datum code (Version 2.1: JRC proprietary value)
IHO - datum code (Version 2.3: IHO datum code)
999 - user defined number
2, 3: 2, 3: Latitude deviation (min), N / S
4, 5: 4, 5: Longitude deviation (min), E / W
6: Elevation deviation (m), u: sign (+,-) Note 1)
7: Reference datum Null or W84
8: Checksum
Note 1) Deviation length is not fixed
■ GSA (GPS 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
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
1: Positioning mode
selection
2: Positioning dimensions
3 = 3-D positioning
3 - 14: Number of satellites used for positioning PRN number (For less than 12
satellites, the field is "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: Number of satellites used for positioning PRN number (For less than 12
satellites, the fields is NULL.)
(Version 2.3)
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)
16: HDOP (4 digit fixed length) (Version 2.3)
17: VDOP (4 digit fixed length) (Version 2.3)
18: Checksum (Version 2.3)
7 8
M = manual selection, (2-D or 3-D fixed), A = automatic
1 = No position measurement, 2 = 2-D positioning,
Note 1)
Note 1)
17 18
Appendix 2-5