18
Declination Mode
Declination, also called magnetic variation,
is the difference between true and magnetic
north, relative to a point on the earth. It is
measured in degrees to the east or west of
true north. The PNI V6000 corrects for dec-
lination electronically. Correcting for dec-
lination is accomplished by storing in the
correct declination angle, and then changing
the heading reference from magnetic north
to true north (see following section). Decli-
nation angles vary throughout the world, and
change very slowly over time. See page 31
for a declination angle map for the United
States. For the greatest possible accuracy,
go to the National Geophysical Data Center
web page below to get the declination angle
based on your latitude and longitude:
http://www.ngdc.noaa.gov/seg/potd/
ushd.shtml.
If you do not know your exact latitude and
longitude, go to the web page below to get
latitude and longitude from your city and
state or from your zip code:
http://www.census.gov/cgi-bin/gazetteer
PROGRAMMING AND OPERATION
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