The GPS navigator picks up signals from three or more satellites (more is better), compares the timing signals and then determines its location on the surface of the earth with accuracy in the tens of meters. The satellites each carry an ultra-accurate, cesium-based atomic clock, and broadcast a timing signal at precise intervals. It’s enough to leave a pilot scratching his or her head, but in the next few pages, I’ll try to make sense of it for you.Īll GPS navigators (with or without WAAS) use signals from an artificial constellation of 24 NAVSTAR satellites. Look at one of the new RNAV (GPS) approach plates, and you’ll see unfamiliar terms, especially in the minimums: LPV, LNAV and LNAV/VNAV. ![]() ![]() To VFR pilots, WAAS is just a new level of GPS that’s more accurate and reliable, but to IFR pilots, it brings a confusing array of new options. ![]() Lately, several new acronyms have entered the GPS field most notable among them is WAAS, which stands for Wide Area Augmentation System.
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