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Graham,
Essential the GRT EFIS has all of the functionality of a data logger.  I am
planning on doing some data collection to nail the Vx and Vy speeds.  If
this works the way I think it does I reckon I can collect enough data in one
flight to figure it out.
One cool thing you can do is to do collect data during a flight, run it
though a conversion program to strip out the GPS lat/lon data and feed it
into Google Earth.  When you play it Google Earth generates an image as
viewed from the cockpit.... really cool stuff.
Paul
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