Leupold GX-3i3 Operating Instructions Manual page 18

FUNCTION 3: DAY OF PLAY (dP) TEMPERATURE INPUT
(GX-4i WITH SMART KEY INSTALLED ONLY)
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Temperature is one of the factors used to determine TGR ranges;
inputting the current temperature will increase the accuracy of
your TGR measurement. The default temperature setting is 75
degrees F (25 degrees C).
NOTE: If yards is selected as the desired measurement output,
the temperature will automatically be measured in Fahrenheit. If
meters is selected, the temperature will be measured in Celsius.
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