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Garmin GPSMAP 60CSX Manual

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GPSMAP 60CSx Owner’s Manual 97
APPENDIX >
What is WAAS/EGNOS?
The Wide Area Augmentation System (WAAS) is an
FAA funded service to improve the overall integrity
of the GPS signal for users in North America. The
European version of WAAS is referred to as EGNOS.
The system is made up of satellites and approximately
25 ground reference stations positioned across the
United States that monitor GPS satellite data. Two
master stations, located on either coast, collect data
from the reference stations and create a GPS data
correction message.
According to the FAA’s Web site, testing of WAAS in
September 2002 confirmed an accuracy performance
of 1-2 meters horizontal and 2-3 meters vertical
throughout the majority of the continental United
States and portions of Alaska.
WAAS and EGNOS are is just two service providers
that adhere to the MOPS (Minimum Operational
Performance Standard) for global Satellite Based
Augmentation Systems (SBAS). Eventually there
will be several services of worldwide geostationary
communication satellites that broadcast integrity
information and differential correction data as
transmitted by ground reference stations.
All SBAS systems use the same receiver frequency;
therefore any operational SBAS system should be
capable of providing your GPS unit with increased
accuracy at any location in the world.
Currently, enabling WAAS on your GPSMAP 60CSx
in regions that are not supported by ground stations,
may not improve accuracy, even when receiving
signals from an SBAS satellite. In fact it can degrade
the accuracy to less than that provided by GPS
satellites alone. For this reason, when you enable
WAAS on your Garmin GPS receiver, the receiver
automatically uses the method that achieves the best
accuracy. To enable or disable WAAS,see page xx.
For more information, go to http://gps.faa.gov/
Programs/WAAS/waas.htm.
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