NMEA Commands 231
NMEA Commands
GDC: Grid Coordinates
$PASHS,NME,GDC,c1,s,[f]
This command enables or disables the $PASHR,GDC message. c1 is the port
designator (A or B) for message output. s3 is ON or OFF. f is the optional message
output rate ranging from 0.05 to 999 seconds depending on the measurement
update rate option installed.
If the command is set without a period, the DG16 uses the period set by the
$PASHS,NME,PER command If the $PASHS,NME,PER command is issued after
this message period has been set, the period resets to the PER setting.
$PASHQ,GDC,[c1]
This command queries the 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 is in the format:
$PASHR,GDC,m1,s2,f3,f4,d5,d6,f7,f8,M,f9,M,d10,s11,s12*cc
Table 8.5 outline the message format:.
Table 8.5. 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
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