Leupold GX-3c Operating Instructions Manual page 13

TO ACTIVATE FOG MODE:
1) Press POWER to activate the rangefinder .
2) Press and hold MODE for at least 2 seconds and then release
to enter the Quick Set Menu; the word "Fog" will now appear
in the upper display .
3) While the word "Fog" is displayed, press and release POWER
as necessary until the word "On" is displayed in the lower
portion of the display .
4) 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 .
NOTE: There is no icon for Fog Mode in normal operation. When
powered on the unit will display Fog On/OFF status to remind
you of the current setting. We recommend turning Fog Mode off
during normal ranging to enable easy location of the pin/flag.
TGR TECHNOLOGY (GX-5c ONLY):
Use of the GX-5c for tournament play is permitted when Local
Rule is in effect (see USGA Decision 14-3/0 .5), and TGR is
turned off .
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