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Many courses have highly reflective prisms included
in key course features. These prisms pro vide your GX
rangefinder with an extremely intense return signal,
allowing it to lock onto the prism quickly and provide
instant feedback that you have accurately ranged the
intended target. When using scan mode to range a
course feature with integral prisms, your GX range-
finder will produce an audible beep and the Prism
Lock bracket will be displayed along with the measured distance. If True Golf
Range has been activated, the TGR distance and Club Selection will be shown
(GX-4 with yellow Smart Key installed only). If True Golf Range (GX-4 with
yellow Smart Key installed only) has not been activated, or you are using a
GX-3, the line of sight distance will be shown. Prism Lock is always activated
and will automatically detect the presence of prisms in course features when
scanning at a distance of 25 yards or greater.
NOTE: Prism lock will only work in scan mode; you must press and hold the
POWER button for your GX rangefinder to lock onto a prism.
Using Prism Lock
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