69
Commands
GDC: 3-D Position in User-defined Grid Coordinates
$PASHQ,GDC,[c1]
This command allows you to query for current position according to the user-defined
grid coordinate system selected through the UDG command, where c1 is the
optional port designator for the output of the response. If a port is not specified, the
receiver sends the response to the current port. The response message does not
output unless the following three conditions are met:
1. The receiver is computing positions.
2. A grid coordinate system has been selected through the UDG command.
3. The conversion from geodetic coordinates to the selected grid coordinate
system has been enabled through the GRD command.
$PASHR,GDC
The response message is output in the format:
$PASHR,GDC,m1,s2,f3,f4,d5,d6,f7,f8,f9,d10,s11,s12*hh
Table 4.16 defines the parameters.
Table 4.16. GDC Message Structure
Parameter Description Range
m1 UTC of position in hours, minutes, and decimal seconds
(hhmmss.ss)
000000.00 to
235959.90
s2 Map projection type EMER, TM83,
OM83, LC83,
STER, LC27,
Tm27, TA22
f3 Easting (x) of the user grid coordinate (meters) -9999999.999 to
+9999999.999
f4 Northing (y) of the user grid coordinate (meters) -9999999.999 to
+9999999.999
d5 Positioning mode Indicator
• 1: Autonomous position
• 2: RTCM differential, or CPD float position
• 3: Carrier Phase differential (CPD) fixed
1, 2, 3
d6 Number of GPS satellites being used 3 - 12
f7 Horizontal Dilution of Position (HDOP) 00.0 - 99.9
f8 Altitude (meters) -9999999.999 to
+9999999.999
G12RevD.book Page 69 Tuesday, April 2, 2002 4:33 PM
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