Table of Contents
Advertisement
operator's Manual
Special Notes
GPS
About GPS Navigation
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 ofthe US Department
of Defense.
OGPS
This GPS receiver's position accuracy is improved to 5 meters or better
for 95% ofthe time, subject to the availability, accuracy, and control Of
the DGPS correction transmission from the Beacon Station, or other
reference station connected at the time of usage.
The differential GPS position is that ofthe navigator GPS antenna, and
not that ofthe beacon antenna, ifa separate beacon antenna is in use.
In addition, the beacon radio signal which carries the DGPS correc-
tions may be hampered by weather conditions such as heavy rain,
snow, and thunder storms. The beacon radio signal may also be inter-
rupted by powerful 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.
z
Version 7.5
Advertisement
Table of Contents
