Thought it might help if we post up some examples of GPS posts that are seriously erroneous and, of course, from 'non GPSTC approved' GPS's.

Here is the latest:

www.ka72.com/Track/t/435170

It is assumed this is a windsurfer, but it may not be. In any case, even if it was a kite or a foiler, doing thise speeds on a beam reach in open water is extremely unlikely, let alone 49 knots!

And of course, there is no way to validate anything.