27
Changing Map Datums
If you are using a map (or chart) in conjunction with your
GPS Blazer12 you need to insure that the datum used by the
GPS Blazer12 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 Blazer12 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
Blazer12 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.