Good news that the Bluetooth GPS resolved the issue for you. I can have up to 3 separate GPS devices displaying speed at once, and it's not unusual for one to be out by 1 or 2 km/h - but other times, they'll all read the same, and then sometimes, I have a "residual speed" of 2 -3 km/h while I'm stationary.
In the past I've run OziExplorer on devices that struggled with it, and map format can make a significant difference to performance. .oxfx3 and .ozf4 formats work better than .ecw format.
Originally posted by sharkcaver
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