Map Datums - Garmin GPS 150 Pilot's Manual

REFERENCE

Map Datums

Map Datum page
User Datum page
Section
5
Map Datum page with 'User' selected.
60
The GPS 150 contains over 100 map datums for you to use when navigating with
the GPS 150. By default, your GPS 150 calculates positions using the WGS-84 map
datum. If you are using charts based on another datum, you must set the GPS 150 to
use that datum if you are using the coordinates provided on that chart. Using the
WGS-84 datum on the GPS 150 while using a different datum for maps or other navi-
gation devices could result in significant differences in position information.
If you are using maps for reference only, the GPS 150 will provide correct
navigation guidance to the waypoints contained in the database regardless of the
datum selected.
To change the map datum to one listed in Appendix E:
S O
1. Press and rotate
C
2. Press to highlight the current map datum.
K
3. Rotate to change the datum.
C
4. Press to complete.
To create a user datum:
S O
1. Press and rotate
C O
2. Press and rotate
3. Enter the 5 parameters of the map datum using
The sign of each value (+/-) should follow the convention: WGS84-local geodetic system.
O
4. Rotate to highlight 'ok?' and press
5. To activate the user datum, select 'USER' on the map datum page as described above.
until the Map Datum page is displayed.
until the Map Datum page is displayed.
E
to highlight 'Define user datum?'. Press
K O E
and . Press
E
.
.
to accept a field.