A Appendix A
The GPS receiver used with SatViewer can provide DGPS through the Satellite Based Augmentation
System (SBAS), which uses multiple ground stations and then broadcasts corrections to the end
users via SBAS satellites.
Usage
Configures the DGPS requirements as follows:
l Auto: will use DGPS when available, but continue to provide autonomous (uncorrected)
positions when DGPS is not available.
l DGPS Required: will only provide positions when DGPS is available. Autonomous positions will
not be available. When DGPS data is available, it can be applied to your GPS position to
increase the accuracy of your position reading.
l Ignored: will not provide DGPS positions even when available.
Note – Due to the limited number and availability of SBAS satellites in the sky, DGPS coverage from SBAS
satellites may not always be available. Therefore, it is recommended that you use the Auto setting where the
GPS will use and apply DGPS data when available, but will continue providing positions even when DGPS is not
available.
Type
Allows you to select SBAS ON or SBAS OFF. (Currently SBAS is the only DGPS service available, but
other DGPS systems may be available in the future.)
SBAS Sat. PRN
Configures which SBAS satellite to use. Selecting Auto instructs the GPS receiver to automatically
make the selection.
Return to Default Settings
If connected to the unit’s GPS receiver, restores DGPS settings back to default state:
l Usage: Auto
l Type: SBAS ON
l SBAS Sat PRN: Auto
If disconnected from your unit’s GPS receiver, this button has no effect on DGPS settings.
Ranger Series Handheld Computer 70
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