For deeper pockets, a tempting buy might be a whole new airplane with a non-WAAS glass panel. That could be a fine thing, but a future WAAS upgrade could shock you with its cost. Cessna's Service Bulletin SB07-34-07 lists the GPS/ WAAS modification kit for upgrade at $18,295 for single-engine G1000 models. Manpower is listed at approximately 11.5 hours. Meanwhile, an Avidyne/Garmin-equipped Cirrus aircraft not equipped with WAAS looks like a better deal on the surface, but it may not be.
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