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2.3.2 [V/%] key
Pressing the V/% key will change the Vertical angle display to
V%(slope).(At the shipping,it is set at Zenith 0°)
By special key operation,horizontal 0° (VH) and Compass (Vc)
can be set.
(Factory default is Zenith 0°)
(Refer to 3.1 Setting of vertical angle.)