Another thought is passive such as a gyro system or electronic compass
http://www.robot-electronics.com/

Are you using a model plane?

Do you want to know its distance from you or are is the model? trying to do
it's own calculation internally?

*************************************************

Roy Hopkins

rdhopkins@ihug.co.nz

*************************************************

> > And a $80 GPS puck giving meter position accuracy is too expensive for



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