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Figure 42: NAVconfig Global Coordinate System properties window
From the Global Coordinate System tab you can choose which reference datum to output latitude and longitude
relative to. The default system and the standard for GPS is the WGS 84 datum.
Note: Currently outputs will only reference datums other than WGS 84 in post- processing. Real-time outputs
will still be referenced to WGS 84 even if another option is selected.
The Altitude reference can be compared to either ellipsoidal or geoidal height. If Ellipsoid is selected, the
altitude will be output with respect to the reference ellipsoid selected in the coordinate datum section. If
Geoid
(receiver default) is selected, the altitude will be relative to the geoid used in the GNSS receivers. A Custom
geoid file can be used for local variations. To download supported geoid files, go to
http://support.oxts.com/local-geoid-files. The UGF file must be saved in
C:\Users\
username
\Documents\OXTS\Shared\Custom geoid files. Once the file is downloaded and saved in
this location, it can be selected from the dropdown box.
A constant offset to the specified altitude reference can be applied by checking the Set offset box typing in a
value into the cell.
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