with built-in beacon receivers are designed to provide low
cost reception of DGPS corrections broadcast (normally
free of charge) by coastal authorities.
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 accu-
racy is dependent upon multipath environment, number
of satellites in view, baseline length (for local services),
ionospheric activity, and HDOP. 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 U.S. Department of Defense.
DGPS
This GPS receiver’s position accuracy is dependent upon
ionospheric activity, multipath, subject to the availability,
accuracy, and control of the DGPS correction transmis-
sion from the Beacon Station.
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 interrupted by powerful radio trans-
mitters operating in long wavelength bands.
Charts and Navigational Aids
Positions obtained from charts are not always as accu-
rate as your navigator (due to environmental changes,
the dates of charts, and datum offsets if the datum dif-
fers from the one in use by the navigator). The position
of a floating aid can differ due to tide, set and drift.
Compass Safe Distance
> 1 meter
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