Garmin GPS 72H - Manual (Page 33)

GPS 72H Owner’s Manual 27
Settings
100 datums available. Only change
the Map Datum if you are using a
chart or a paper map that specifies a
different datum in the legend.
NOTICE: Selecting the
wrong map datum can result
in substantial position errors.
When in doubt, use the default
WGS 84 datum for best overall
performance.
North Reference—select the
reference used in calculating heading
information.
Auto—provides magnetic north
heading references which are
automatically determined from
your current location.
True—provides headings based
upon a true north reference.
Grid—provides headings based
on a grid north reference.
User—allows you to specify the
•
•
•
•
magnetic variation at your current
location, and provides magnetic
north heading references based
on the value you entered.
NOTE: If User is selected, you must
periodically update the magnetic
variation at your present position.
NOTICE: Failure to update this
setting may result in substantial
differences between the
information displayed on your
GPS 72H and external references,
such as a magnetic compass.
Magnetic Variation—displays the
magnetic variation at your current
location. When you select User for
the North Reference setting, this
field is used to enter the magnetic
variance.