Defined name GPS offset provides a setting for the difference between
the GPS Reference point (Phase centre) and the scanner reference level
(see the mark on the scanner base). The default setup assumes the GPS
Reference point is at the top of the GPS mount (this defaults to
514.5mm for the Maptek XR3 scanner). For more accurate reading you
add the height of the GPS isolator (139mm) and GPS offset value (usually
written underneath the GPS receiver unit and/or user manual). This
example uses a Trimble R6 with an offset of 64.9mm. The total of the
measurements is a negative number entered into Define name GPS
offset.
If the GPS receiver is set up differently an adjustment may be necessary
to correct the difference. For any other brand or model of GPS receivers
consult the GPS user manual.
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