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Here is a web page that has a java applet for calculating TAS from GPS
ground speed readings.  You do not have to fly any particular distance on
each leg, just until you get a stable reading.

The page also describes the math behind the calculation.

   http://www.reacomp.com/true_airspeed/index.html

Bob Belshe
N19BJ

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.