Took the gt31 and proto 5hz for a drive yesterday, had them both in a paqua (not because I expected to flood the car, just to keep them next to each other), on the dash as close to the windscreen as I could get.




Here's a classic example of a simulated gybe.





blue line is the GT31, pink is the 5hz unit.

But there are some examples that don't look as good, the thoughts are, that the satellite has only a clear view in one direction, and changing direction can cause funny things to happen as the gps adjusts to a new set of satellites.
I had thought I should attach the pacqua to the roof racks, but was worried about something nasty happening.