Data Logs
Appendix C
SPAN-SE User Manual Rev 1
199
Field
Structure
Field Description
Symbol
Example
1
$GPGSA
Log header
$GPGSA
2
mode MA
A = Automatic 2D/3D
M = Manual, forced to operate in 2D or 3D
M
M
3
mode 123
Mode: 1 = Fix not available; 2 = 2D; 3 = 3D
x
3
4 - 15
prn
PRN numbers of satellites used in solution (null for unused
fields), total of 12 fields
GPS
= 1 to 32
SBAS = 33 to 64 (add 87 for PRN number)
GLO
= 65 to 96
1
xx,xx,.....
18,03,13,
25,16,
24,12,
20,,,,
16
pdop
Position dilution of precision
x.x
1.5
17
hdop
Horizontal dilution of precision
x.x
0.9
18
vdop
Vertical dilution of precision
x.x
1.2
19
*xx
Checksum
*hh
*3F
20
[CR][LF]
Sentence terminator
[CR][LF]
1. The NMEA GLONASS PRN numbers are 64 plus the GLONASS slot number. Current slot
numbers are 1 to 24 which give the range 65 to 88. PRN numbers 89 to 96 are available if slot
numbers above 24 are allocated to on-orbit spares.
