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Juniper Systems LandMark CE User Manual

Page 42

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42 LandMark CE User’s Manual

Units Tab

The Units tab is used to format data. For example, say that your data
needs to be calculated in feet, with magnetic declination set, in UTM
scale, and mean sea level altitude reference set. Set up all of these
confi gurations in the Units tab. Selected settings are also used in
displayed data for Keyboard Wedge and Memory Exchange.

Datum

The Datum option is a set of constants used for calculating
coordinates on earth. Datum points are used by the GPS to reference
a point or line in measuring elevation. LandMark CE automatically
defaults to WGS-84, the datum constants established by the World
Geodetic System in 1984 (WGS 84).

A selection of over 200 different map datum points from around
the world can be used to convert the position to a different datum.
When waypoints are stored, they are always recorded in the WGS 84
datum.