Leupold GX-3c Operating Instructions Manual page 17

To continue through the Quick Set Menu and manipulate
another feature, press and release MODE
until the appropriate icon is displayed .
DAY OF PLAY ALTITUDE INPUT (dP)
(GX-5c ONLY):
Altitude is one of the factors used to determine
TGR ranges; inputting the local elevation/
altitude will increase the accuracy of your TGR measurement .
The default altitude setting is 1000 feet, and will be shown in the
lower portion of the display .
NOTE: Altitude is always measured in feet.
MANUALLY INPUT THE DAY OF PLAY ALTITUDE:
1) Press POWER to activate the rangefinder .
2) Press and hold MODE for at least 2 seconds to enter the
Quick Set Menu .
3) Verify that TGR is turned on; if TGR is not activated, you will
not be able to enter the current altitude, see "To Activate TGR" .
4) Press and release MODE until "Alt" is displayed .
5) While the "Alt" is flashing, press and release POWER
to change the current altitude setting to match current
conditions; each depression of POWER will increase the
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