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GMP: GNSS Map Projection Fix Data
$--GMP,m1,s2,s3,f4,f5,s6,d7,f8,f9,f10,f11,d12*cc
Parameter
$GPGMP: Only GPS satellites are used.
"$--GMP"
$GLGMP: Only GLONASS satellites are used.
Header
$GNGMP: Several constellations (GPS,
SBAS, GLONASS) are used.
m1
Current UTC time of position (hhmmss.ss)
Map projection identification:
s2
• LOC: Local coordinate system
• Empty if no local coordinate system
Map zone
s3
(empty)
X (Northern) component of grid (or local) coor-
f4
dinate, in meters
Y (Eastern) component of grid (or local) coor-
f5
dinate, in meters
Mode indicator:
• N: No fix
• A: Autonomous
s6
• D: Differential
• R: Fixed RTK
• F: Float RTK
Number of GNSS Satellites being used in the
d7
position computation
f8
HDOP
Altitude above mean seal level, or local alti-
f9
tude, in meters.
f10
Geoidal separation in meters.
f11
Age of differential corrections, in seconds
d12
Base station ID
*cc
Checksum
Description
Range
$GPGMP,
$GLGMP,
$GNGMP
000000.00-
235959.99
LOC
±999999999.999
±999999999.999
N, A, D, R, F
3-26
0-99.9
± 99999.999,M
± 999.999,M
0-999.9
0-4095
*00-*FF
139
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