Garmin GPS II - Manual (Page 81)

75
Map Datums
The ‘map datum’ field is located just below the ‘position format’ field, and comes
with a WGS 84 default setting. Although 106 total map datums are available for use
(see Appendix F for map datums), you should only change the datum if you are
using maps or charts that specify a different datum than WGS 84.
To select a map datum:
1. Highlight the ‘datum’ field, and press ENTER.
2. Select the desired setting, and press ENTER.
To define a user datum:
1. Highlight the ‘datum” field, and press ENTER.
2. Scroll through the map datum options until ‘USER’ appears, and press ENTER.
3. Enter values for ‘DX’, ‘DY’, ‘DZ’, ‘DA’, and ‘DF’ using the rocker keypad, and press
ENTER.
4. Highlight ‘SAVE?’, and press ENTER. The setup menu will reappear.
The user datum function is
recommended only for individ-
uals trained in cre a t i n g
map/chart datums. Incorrect
entries may result in substan-
tial position errors.
REFERENCE
GPS II 7/23/98 4:05 PM Page 75