NorthStar 951X Operator's Manual page 178

Chapter 11 - Customizing the Unit
Changing satellite
elevation
Page 168
Under normal operating conditions, this "time-out" should be
set to one minute (the default value set at the factory) to guar-
antee the highest accuracy. In poor weather conditions, this
value can be increased to a maximum of four minutes to
ignore occasional outages in the differential reception (if a
minor loss of accuracy can be tolerated).
After this "time-out" period elapses with no receipt of DGPS
data, the unit reverts to navigating with normal GPS, the DGPS
display indicator (shown at left) is turned off, and the "DGPS
lost" alarm sounds, if enabled (see "Understanding the alarms"
starting on page 132). DGPS navigation resumes automatically
as soon as valid corrections are received again.
To change this option, press the (',7 menu key, then press
the &85625 3$' to display your available choices. Press the
(17(5 key to make your selection, or &/($5 to leave the
option unchanged.
A period of 30 seconds or less is, in many cases, too short and can lead
to intermittent problems. Generally, one minute provides good navigation
accuracy, and is best left unchanged.
The LOWEST SAT ELEVATION option is used primarily in tech-
nical applications where the unit must track all visible satel-
lites, regardless of how low they're situated relative to the
NOTE:
951/952 Operator's Manual Rev. B