WayFinder V7000, Руководство по эксплуатации

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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 Wayfinder V7000 corrects
for declination electronically. Correcting for
declination is accomplished by storing in the
correct declination angle, and then changing
the heading reference from magnetic north
to true north (see following section). Dec-
lination 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:
www.ngdc.noaa.gov/cgi-bin/seg/gmag/dsnth1.pl
If you do not know your exact latitude and
longitude in the USA, go to the web page
below to get latitude and longitude from your
city and state or from your zip code:
www.census.gov/cgi-bin/gazetteer
Outside the USA try the Getty Thesaurus at:
www.getty.edu/research/tools/vocabulary/tgn/
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