Eagle Electronics 642c iGPS - Manual (Page 84)

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on the map. It then shows the present position as distance on the map
from that reference point.
For example, if it shows a distance of UP 4.00" and LEFT 0.50", you
then measure up four inches and to the left a half-inch from the refer-
ence point on the map to find your location.
To configure a map fix:
To use this format, you need to follow these steps in order. Take a map
of the area and determine a reference latitude/longitude.
NOTE:
In order for this system to work, the latitude/longitude lines must
be parallel with the edge of the map. USGS maps are parallel, oth-
ers may not be. Also, this works better with smaller scale maps,
such as 1:24000.
The reference position can be anywhere on the map, but the closer it is
to your location, the smaller the numbers you will be working with.
Once you have decided on a reference position, you can save it as a way-
point. See the waypoint section for information on saving a waypoint.
Save the reference position as a waypoint. Exit the waypoint screens.
1. Press MENU | MENU |
↓ to
GPS S
ETUP
| ENT .
2. Press
↓ to
C
OORDINATE
S
YSTEM
| ENT .
3. Press
↓ to
S ETUP M AP F IX
| ENT .
The screen below appears, and M AP S CALE
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, like 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.