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GPS F.A.Q.

WAAS is an FAA-funded project designed to improve the overall accuracy and integrity of GPS signals for flying in instrument meteorological conditions, primarily during the approach and landing phases of flight. It is a space-based system that broadcasts integrity information and correction data as determined by ground reference stations. At this time, the system is still in the development stage. The goal is to provide reliable signals with an accuracy of seven meters (21-22 ft), both horizontally and vertically, 95+% of the time. Current tests show the actual accuracy to be on the order of 2-3 meters. See http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas for more information.

For those GPS units that are WAAS enabled, a second antenna is not necessary to receive the signal.

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