147
Commands
Typical GDD message:
$PASHR,GDC,015454.00,EMER,588757.623,4136720.056,2,04,03.8,00012.123,M,
-031.711,M,14,1010,W84*2A
Table 4.72 describes the typical GDD message.
f9 Geoidal separation in meters w.r.t.
selected datum
±999.999
M Geoidal separation units (M = meters) M
d10 Age of differential corrections 0 - 999
s11 Differential reference station ID 4 char string
s12 Reference Datum for the map projection 3 char string
cc checksum
Table 4.73. Typical GDC Message
Item Description
015454.00 UTC time
EMER Equatorial Mercator map projection
588757.623 User Grid easting (X) coordinate
4136720.056 User Grid northing (Y) coordinate
2 RTCM differential position
04 Number of satellites used to compute position
03.8 HDOP
00012.123 Altitude
M Altitude units (M = meters)
-031.711 geoidal separation w.r.t. selected datum
M geoidal separation units (M = meters)
014 age of corrections
1010 Differential Station ID
W84 Reference datum is WGS 84
2A checksum
Table 4.72. GDC Response Message Format
Parameter Description Range
G12RevD.book Page 147 Tuesday, April 2, 2002 4:33 PM
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