I wouldn't take off with an inoperative pitot tube and depend on my GPS
ground speed read out but....
if you're already inflight when you lose your IAS indicator it would be
really smart to pull out your GPS and use the ground speed read out as an
gross indication of your indicated airspeed. Maintain a large margin over
your desired IAS until you enter an area like landing where you want to be
somewhat near the correct speed. Check the headwind and add that to your
desired IAS on final. I'd maybe add 10 knots to that for safety.

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B-58 Hustler History: http://members.cox.net/dschmidt1/
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"Emilio" wrote in message
...

A portion of thread from different news grope:
With aircraft equipped with GPS that shows your true speed, can you fly by
it when pitot tube is down?

Emilio.