132
GMP: GNSS Map Projection Fix Data
$--GMP,m1,s2,s3,f4,f5,s6,d7,f8,f9,f10,f11,d12*cc
Parameter Description Range
“$--GMP”
Header
$GPGMP: Only GPS satellites are used.
$GLGMP: Only GLONASS satellites are used.
$GNGMP: Several constellations (GPS,
SBAS, GLONASS) are used.
$GPGMP,
$GLGMP,
$GNGMP
m1 Current UTC time of position (hhmmss.ss)
000000.00-
235959.99
s2
Map projection identification:
• LOC: Local coordinate system
• Empty if no local coordinate system
LOC
s3
Map zone
(empty)
f4
X (Northern) component of grid (or local) coor-
dinate, in meters
±999999999.999
f5
Y (Eastern) component of grid (or local) coor-
dinate, in meters
±999999999.999
s6
Mode indicator:
• N: No fix
• A: Autonomous
• D: Differential
•R: Fixed RTK
• F: Float RTK
N, A, D, R, F
d7
Number of GNSS Satellites being used in the
position computation
3-26
f8 HDOP 0-99.9
f9
Altitude above mean seal level, or local alti-
tude, in meters.
± 99999.999,M
f10 Geoidal separation in meters. ± 999.999,M
f11 Age of differential corrections, in seconds 0-999.9
d12 Base station ID 0-4095
*cc Checksum *00-*FF
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