Editing Wide Area Augmentation System (section)

===Integrity===
Integrity of a navigation system includes the ability to provide timely warnings when its signal is providing misleading data that could potentially create hazards. The WAAS specification requires the system detect errors in the GPS or WAAS network and notify users within 6.2 seconds.<ref name=WASSspec/> Certifying that WAAS is safe for [[instrument flight rules]] (IFR) (i.e. flying in the clouds) requires proving there is only an extremely small probability that an error exceeding the requirements for accuracy will go undetected. Specifically, the probability is stated as 1×10<sup>−7</sup>, and is equivalent to no more than 3 seconds of bad data per year. This provides integrity information equivalent to or better than [[receiver autonomous integrity monitoring]] (RAIM).<ref name="House_Subcommitee_0600">US House of Representatives Committee on Transportation's Subcommittee on Aviation [http://commdocs.house.gov/committees/Trans/hpw106-100.000/hpw106-100_1.HTM Hearing on Cost Overruns & Delays in the FAA's Wide Area Augmentation System (WAAS) & Related Radio Spectrum Issues]. June 29, 2000</ref>