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latitude/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 can save it as a
waypoint. See the waypoint section for information on saving a
waypoint. Save 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. This is generally at the bottom of the paper
map. It's shown as a ratio, for example 1:24000. Press
EXIT and the unit
returns to the Configure Map Fix screen.
Configure a map fix so the unit 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
command
SET AS ORIGIN selected; press ENT and the unit returns to the
Configure Map Fix menu. Finally, press
EXIT to close this menu. Now
press ↑ to
COORD SYSTEM|ENT, select MAP FIX from the list and press
ENT|EXIT|EXIT|EXIT. All position information now shows as a distance
from the reference point you chose.