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Operator's Manual
DGPS Beacon System
Keypad & Display Description
As Maritime Safety Administrations, Navy, and Coast Guard Organi-
zations realize the limitations of standard GPS positioning, many have
begun installing DGPS Beacon Stations. While an understanding of
this system is not necessary for operating receivers with internal bea-
con receivers, you may want to read on to have a better understanding
of how your receiver is capable of achieving the high levels of accu-
racy made possible by this network of transmitters.
The DGPS Beacon System is comprised of three segments: the refer-
ence station, Integrity Monitor (IM) equipment located at the beacon
site, and the Navigator equipment located on board the user's boat or
vehicle. The DGPS beacon system design is illustrated below.
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Commercial I
Personal Craft Users
5271-01C.SJO
Because of the limited range of the beacon transmitters, typically 150
to 400 km, the corrections generated by the reference station are al-
ways valid for users who can receive the correction signals and main-
tain a 5 meter or better accuracv fieure.
6
Version 1.5
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