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marked on a char t. Your unit shows a longitude position that is .244 min-
utes east of the one on the chart and .047 minutes north latitude. Using
the PCF feature, you can make the Eagle Explorer match the char t you’re
using. If you move, the unit will continuously add the change to all posi-
tion, navigation, and mapping displays. This makes it more closely match
the datum used by the chart. For this reason, you should be careful when
entering the PCF offset. It’s saved in memory and doesn’t change when
the unit is turned off. However, resetting the unit does erase the PCF
offset.
To change the PCF offset, first press the MENU
key, then highlight the “GPS Setup” label and press
the right arrow key. Now highlight the “Set PCF
Offset” label. Finally, press the right arrow key
again. A screen similar to the one at right ap-
pears.
Now enter the correction for your location. Re-
member, this is the difference between the loca-
tion shown on the present position display and
the position shown on the chart. In this example,
we entered 0 degrees, 0.047 minutes north lati-
tude and 0 degrees, 0.244 minutes east longi-
tude. That is the difference between the present
position shown by the Eagle Explorer and the one
on our chart.
After you’ve entered the latitude/longitude correc-
tion, press the ENT key to accept it. The Eagle
Explorer erases the PCF entry screen and returns
to the navigation or mapping screens with the cor-
rection factor applied.
POSITION PINNING
When using a GPS receiver at extremely low speeds, it can have trouble
determining your course over ground, or direction you’re travelling. This is
due in large part to SA, or selective availability. SA is small inaccuracies
purposefully put into the GPS satellite’s signal by the government. This
cause wide variations in the track display and other navigation displays
when using the unit at slow speeds.