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The default setting is WGS 84. The unit automatically selects the
best datum depending on your chosen location 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 location.
True provides headings based on 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 location and
provides magnetic north heading references based on the variation
you enter. Enter the magnetic variation of your current location in
the Magnetic Variation eld if you 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 location. You must update the magnetic variation as
your location changes. Failure to update this setting can result in
substantial differences between the information shown on your
unit and external references, such as a magnetic compass.
Welcome Sub Tab
Use the Welcome sub tab to enter information, such as your name
and address, or a welcome message that appears when you turn on
your GPSMAP 278.
Welcome Sub Tab
To add a welcome message:
1. Press up or down on the ROCKER to highlight one of the
Welcome Message elds, and press ENTER.
2. Use the ROCKER to enter information in the elds. You do
not need to enter information in every eld. When nished,
press ENTER again.
GPSMAP 278 Owner’s Manual 85
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