176 G12 OEM Board & Sensor Reference Manual
Typical RMC message:
$GPRMC,213357.20,A,3722.410857,N,12159.773686,W,000.3,102.4,290498,15.4,W
*43
Table 4.102 describes the typical RMC response message.
c11 Direction of magnetic variation:
• Easterly variation - subtract this value from true north
course
• Westerly variation - add this value to true north
course
E (ast)
W (est)
*hh The hexadecimal checksum is computed by exclusive -
ORing all of the bytes in the message between, but not
including, the $ and the *. The result is *hh where h is a hex
character.
0 to 9 and A through F
Table 4.102. Typical RMC Message
Parameter Description
213357.20 UTC time of the position fix (hhmmss.ss)
A Valid position
3722.410857 Latitude
N North latitude ddmm.mmmmmm
12159.773686 Longitude ddmm.mmmmmm
W West longitude
000.3 Speed over ground, knots
102.4 Course over ground, degrees True
290498 29 April 1998
15.4 Magnetic variation, degrees
W Westerly variation (add to the true course)
*43 Checksum
Table 4.101. $GPRMC Message Format (Continued)
Parameter Description Range
G12RevD.book Page 176 Tuesday, April 2, 2002 4:33 PM
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