Leupold GX-6c Operating Instructions Manual page 18

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 altitude is flashing, press and release POWER
to change the current altitude setting to match current
conditions; each depression of POWER will increase the
altitude setting by 500 feet until 9999 has been reached,
at which time the setting will return to 0 and begin
increasing again .
6) To save the changes and return to ranging mode, let the unit
sit idle for at least 30 seconds until an automatic power-down
occurs, or simply press and hold MODE for at least 2 seconds .
To continue through the Quick Set Menu and manipulate
another feature, press and release MODE until the appropriate
icon is displayed .
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