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This Belltronics unit is the same as the Escort unit.
It uses accelerometers.
I have a GTech PRO and a Gtimer(escort) which is what this Belltronics unit is.
I also have a VBox GPS performance meter.
The GTech is about .2 seconds off.
The GTimer is about .7 seconds off.
Both are off in the more positive way... meaning they say they are quicker than the VBox.
And a 10KHZ GPS performance meter is where I'd place my accuracy.
Just a little FYI
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