Magellan GPS 310 - Manual (Page 33)

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Changing Map Datums
If you are using a map (or chart) in conjunction with your
GPS 310 you need to insure that the datum used by the GPS
310 matches the one used in creating the map. The map
datum can usually be found in the legend box of the map or
chart. The GPS 310 offers the choices of WGS84 (default),
NAD27, AUST 84, EUROPE 50, GRB 36, IRELAND, KKJ,
RT90, S AMERICA 69, SWISS, FRENCH, GERMAN, and
TOKYO.
Press the MENU key until SETUP is displayed at the top of
the screen and press ENTER . Use the RIGHT ARROW until
SETUP MAP DATUM is displayed. Press ENTER again, the
currently used map datum begins to flash. Use the RIGHT/
LEFT ARROWs to scroll through the list of map datums and
press ENTER when the desired datum is displayed.
Some coordinate systems can be used only with a
specific datum (i.e., OSGB coordinate system can be
used only with the GRB 36 datum). Your GPS 310
automatically selects the proper datum when you
select that coordinate system and will not allow you
to change the datum until you select a different
coordinate system.