Leupold GX-5i Operating Instructions Manual page 15

FOG MODE
The Fog Mode can be used in foggy/rainy conditions
to screen out false readings from raindrops or other
atmospheric interference to provide an accurate range.
Fog Mode changes the algorithm to look for the "last"
target. To increase ranging accuracy always range the
ground around the pin/flag when Fog Mode is on.
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.
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