Leupold GX-5i Operating Instructions Manual page 22

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 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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