Juniper Systems LandMark CE - Manual (Page 45)

LandMark CE User’s Manual 45
Altitude Reference
The Altitude Reference option displays the altitude as MSL (mean
sea level) or HAE (height above ellipsoid). When MSL is selected,
its value is calculated when the GPS receiver provides the geoidal
separation value in the NMEA GGA packets from the satellite.
Mask Tab
The Mask tab is used to set the GPS signal masking parameters while
marking waypoints. Only those GPS fi xes that meet the specifi ed
criteria are used in averaging a waypoint. In essence, inaccurate GPS
positions are screened with this feature.
The check boxes are used to enable or disable specifi c masking
features. The edit boxes on the right of the check boxes are used to
specify the mask value.
Max PDOP
Select the Max PDOP (Maximum Percent Dilution of Precision)
option and then enter a value in the box to the right. This selection
masks GPS PDOP readings greater than the value entered. Only
computed waypoints with a PDOP equal to or less than the value
you entered are used.
Max EHE
Select the Max EHE (Maximum Estimated Horizontal Error) option
and then enter a value in the box to the right. This masks GPS EHE
readings greater than what you enter. Only computed waypoints
with an EHE equal to or less than the value entered are used.
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