Follow the steps below on how to change Datum on the inReach SE & inReach Explorer.
1. Go to "Settings."
2. Select "Units."
3. Select "Datum."
4. Select a datum option (WGS84 is the recommended default).
More information on datums can be found here:
Basic definition: http://en.wikipedia.org/wiki/Geodetic_datum
Datum basics by ESRI: http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Projection_basics_the_GIS_professional_needs_to_know
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