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Laser Rangefinders I
Entering a compass offset
The Criterion laser rangefinders let you specify two compass offsets:
A Declination Offset, which can be used to specify the local
difference between magnetic North and true North
A Fixed Offset, that can be used to make sure the alignment of
the compass with the laser unit is accurate.
Your Criterion laser rangefinder has an accompanying Certificate of
Calibration, which lists the preconfigured fixed compass offset, if any.
It is safest not to modify this value.
You can, however, modify the declination offset to take account of
local magnetic field variations. Only do this if you are operating in an
area where a local phenomenon such as large mineral deposit or
mountain range has a substantial and stable influence on the earth’s
magnetic field.
Use the following procedure to modify the declination offset:
1. Select the top-level SYSTEM menu from the Criterion’s main
menu.
2. Press the ↑ or ↓ arrow buttons to scroll down to the COMPASS
OFFSETS entry:
COMPASS
OFFSETS
3. Press the ENTER button.
The following screen appears:
DECLINATION DEG
0
4. Use the numeric buttons on the right-hand side of the
Criterion’s control panel to enter the local magnetic declination
offset (in degrees or gradians, as previously configured).
TSC1 Asset Surveyor Operation Manual 319