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Operator's Manual
Special Notes
GPS
Never rely solely on any single navigational aid. Always use whatever
!
information is available, and cross-check information when possible.
GPS expected position accuracy is better than 30 meters (95% of the
time) but may be up to 100 meters occasionally. The derived speed and
course readings may be hampered accordingly. The GPS system was
declared operational in 1994; however, the system's availability and
accuracy are subject to change at the discretion of the US Department
of Defense.
DGPS
This GPS receiver's position accuracy is improved to 2 meters or better
for 95% of the time, subject to the availability, accuracy, and control of
!
the DGPS correction transmission from the Beacon Station.
The beacon radio signal which carries the DGPS corrections may be
hampered by weather conditions such as heavy rain, snow, and thun-
der storms. The beacon radio signal may also be interrupted by power-
ful radio transmitters operating in long wavelength bands.
Charts and Navigational Aids
Positions obtained from charts are not always as accurate as your
navigator (due to environmental changes, the dates of charts, and
datum offsets if the datum differs from the one in use by the naviga-
tor). The position of a floating aid can differ due to tide, set and drift.
!
2
About GPS Navigation
Version 2.0
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