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Chapter 14 - Service and Maintenance Functions
Page 14-6
Adjusting satellite elevation
You can prohibit the 961 from tracking satellites that are close
to the horizon and don't provide high accuracy. The tracking
of low satellites during GPS calculations is used primarily for
technical applications, in which the 961 must track all visible
satellites, regardless of how low they're situated.
In other cases, however, when high-precision fixes are neces-
sary, the advanced user can change this option to hide any low
satellites. This option prevents the use of low satellites as
sources of GPS position information, and avoids potential
errors.
You can adjust this option to 0°, 5°, 8°, 10°, or 15°; however,
Northstar recommends that you leave this option at the fac-
tory setting of 10°.
To change the satellite elevation:
1. At the RECEIVER INFORMATION screen, press the CUR-
SOR PAD to highlight the MIN SAT ELEV field, then press
the EDIT key.
2. Press the CURSOR PAD left or right to select either 0, 5, 8,
10, or 15 degrees.
3. When done, press the ACCEPT key, or CANCEL to leave
the option unchanged.
Viewing the GPS software version
The software version of the GPS receiver is indicated in the
GPS RCVR REV field.
Setting DGPS operation
You can enable or disable the use of differential information.
1. At the RECEIVER INFORMATION screen, press the CUR-
SOR PAD to highlight the DGPS SYSTEM field, then
press the EDIT key.
961 Operations and Reference Manual Rev. D
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