Garmin GPS 75 - Manual (Page 18)

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When the GPS 75 is performing 2D navigation, the last known altitude
will be used in the latitude/longitude computation. If the altitude is not
accurate within a few hundred feet, you should manually enter your
altitude.
To enter the altitude (2D only)...
· Use an arrow key to move the cursor under the altitude.
· Enter the altitude. If your antenna is mounted on a high mast,
make sure you add the mast height. (Remember to complete the
data entry by pressing ENT.)
During initial satellite acquisition, the displayed position is the last
computed position stored in the GPS 75. If your position has moved
several hundred miles or more with the power off, the unit may go into
the Autolocate mode. This process can take up to ten minutes.
Alternatively, you may enter a more accurate initial position to speed up
the acquisition process. (You may also change the position at any time
while you are in simulator mode.)
To enter the latitude/longitude...
· Use an arrow key to place the cursor on the latitude hemispheric
designation (far left).
· Check the hemispheric designation (“N” or “S”) of the latitude. If
it is correct, go to the next step. If it is incorrect, press CLR until
the correct hemispheric designation is displayed.
· Place the cursor on the latitude field and enter the latitude.
Depending on the position format selected (see Section 6.3), you
will enter the latitude in one field (degrees only), two fields
(degrees/minutes), or three fields (degrees/minutes/seconds or
UTM). You must press ENT for each field to confirm the data
e n t r y .
· Check the hemispheric designation (“E” or “W”) of the longitude in
the same manner as above for latitude.
· Enter the longitude (remember to complete the data entry by
pressing ENT).