188 G12 OEM Board & Sensor Reference Manual
Table 4.114 describes the typical VTG response message.
ZDA: Time and Date
$PASHS,NME,ZDA,x,c,[f]
Enable/disable the time and date message or port x, where x is the output port, and
c is ON or OFF, and f is the optional message output rate ranging from 0.05 to 999
seconds depending on the measurement update rate option installed.
The G12 does not output this message unless it computes a position.
If the command is set without a period, the G12 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.
Example
Enter the following command to disable ZDA message on port A.
$PASHS,NME,ZDA,A,OFF
$PASHQ,ZDA,[c1]
This command allows you to query for the ZDA message, 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.
Table 4.114. Typical VTG Message
Field Description
$GPVTG Header
179.00 Course over ground (degrees)
T True course over ground marker
193.00 Magnetic course over ground
M Magnetic course over ground marker
000.11 Speed over ground (knots)
N Nautical miles per hour
000.20 Speed over ground in kilometers/hour
K Kilometers per hour
*3E Checksum
G12RevD.book Page 188 Tuesday, April 2, 2002 4:33 PM
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