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tude/longitude lines must be parallel with the edge of the map. USGS
maps are parallel, others may not be. Also, this works better with
smaller scale maps.) The reference position can be anywhere on the
map, but the closer it is to your location, the smaller the numbers will
be that you'll have to deal with.
Once you've decided on a reference position, you must save it as a way-
point. (See the waypoint section for information on saving a waypoint.)
After you've saved the reference position as a waypoint, exit from the
waypoint screens.
1. Press
MENU|MENU|↓ to GPS SETUP|ENT.
2. Press ↓ to
COORDINATE SYSTEM|ENT.
3. Press ↓ to
SETUP MAP FIX|ENT.
The following screen appears, and
MAP SCALE is highlighted. Press ENT
and enter the map's scale one numeral after another. The scale is gen-
erally at the bottom of the paper map. It's shown as a ratio, for example
1:24000. When the scale is entered, press
EXIT and the unit returns to
the Configure Map Fix screen.
Configure a map fix so the M68 can find your position on a printed
chart or topographical map.
Press ↓ to SELECT ORIGIN|ENT|ENT|ENT to bring up the waypoint list.
Select the waypoint that you saved the reference point under and press
ENT. The unit displays a waypoint information screen with the com-
mand
SET AS ORIGIN selected; press ENT and the unit returns to the Con-
figure Map Fix menu. Finally, press
EXIT to erase this menu. Now press
↑ to
COORD SYSTEM|ENT, select MAP FIX from the list and press ENT|EXIT.
All position information now shows as a distance from the reference
point you chose.