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G GLONASS Commands
G.2.7 MAGVAR
Two field options are included; a standard deviation field and an auto field.
The MiLLennium-GLONASS GPSCard computes directions referenced to True North. Use this command
(magnetic variation correction, see Figure G.1, Page 86) if you intend to navigate in agreement with magnetic
compass bearings. The correction value entered here will cause the "bearing" field of the NAVA/B log, see Page
102, to report bearing in degrees Magnetic. The magnetic variation correction is also reported in the GPRMC and
GPVTG logs. The MiLLennium-GLONASS GPSCard will compute the magnetic variation correction if you use
the auto option.
Example 1:
magvar +15.0
Example 2:
magvar auto
Figure G.1 Illustration of Magnetic Variation & Correction
86
Reference
Description
a
True bearing
b
Local magnetic variation
c
Local magnetic variation correction
(negative of magnetic variation)
d
Heading = 50× True
= 65× Magnetic
e
True North
f
Local Magnetic North
a + (c) = Magnetic bearing
GPS/GLONASS Receiver User Manual Rev 1
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