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Changing the Location Settings
To open the Location tab, press MENU twice to open the Main
Menu. Select Setup from the vertical tab list. Then select Location
from the row of tabs along the top of the page.
Refer to the “Appendix” of this guide for more information about
location formats and map datums. Also visit the National Imagery
and Mapping Agency at http://www.nima.mil for more information
on grids and datums.
Changing the Location Format
When you change the Location Format, you change the coordinate
system in which a given position reading is displayed. The default
format is latitude and longitude in degrees, minutes, and thousandths
of a minute (hddd°mm.mmm).
You should only change the position format if you are using a map
or chart that specifies a different position format or want to use a
format you are familiar with.
Selecting a Different Map Datum
Datums are used to describe geographic positions for surveying,
mapping, and navigation and are not actual maps built in the unit.
You should only change the datum if you are using a map or chart
that specifies a different datum.
The default setting is WGS 84. The unit automatically chooses the
best datum depending upon your chosen position format.
WARNING: Selecting the wrong map datum can result in
substantial position errors. When in doubt, use the default WGS
84 datum for best overall performance.
Selecting a Different Heading Reference
You can select from Auto Mag Var, True, Grid, and User Mag
Var. Auto Mag Var provides magnetic north heading references
that are automatically determined from your current position. True
provides headings based upon a true north reference. Grid provides
headings based on a grid north reference (and is used in conjunction
with the grid position formats).
User Mag Var
allows you to specify the magnetic variation at your
current position and provides magnetic north heading references
based upon the variation you enter. Enter the magnetic variation of
your current position in the Magnetic Variation field if you have
selected User Mag Var for the heading.
WARNING: If User Mag Var is selected, the unit does not
automatically calculate and update the magnetic variation at
your present position. You must update the magnetic variation as
your position changes. Failure to update this setting may result
in substantial differences between the information displayed on
your unit and external references, such as a magnetic compass.
GPSMAP 276C Owner’s Manual 87
CUSTOMIZING YOUR GPSMAP 276C > CHANGING THE LOCATION SETTINGS