how to increase GPS polling rate on Windows Phone 7

Is there any way to increase the gps polling rate in my WP7 app? Right now its updated roughly once a second. I need at least three or four times as much resolution..

I was considering spawning multiple GeoCoordinateWatcher(s), each in their own thread, but that doesn't sound like it would work.

** a bit of background ** I'm trying to measure 0-60 with my application, but am quickly realizing when testing with cars that do sub 5 second 0-60 runs (GTR, ZR1, 911 turbo, etc), sampling once a second isn't going to give me an accurate result.

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It sounds like I have to rely on the accelerometer to get this data and use the GPS data to correlate?

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I think you can ask the GPS for its Position as often as you like... and this probably will result in serial calls to the "GPS chip" - so should get you more results back.

I definitely wouldn't spawn multiple Watchers - its just too hacky a solution - and could well go wrong (far too hard to get them to spread their results uniformly)

Also, more importantly in an A-GPS system on a typical phone, I doubt the GPS would be sufficiently accurate to really make it worthwhile calling more than once a second - even if you are in a car travelling at 120kmh I think that still only make 30 metres per second travel - and your phone will often be struggling to get the accuracy as close as 30 metres (from my observations so far on the RunSat results while cycling).

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No.

Most GPS receivers installed in phones only calculate a solution @ 1 Hz. Even if you manage to get the operating system to give you more frequent updates, the will only change value once per second. The position calculation is done on an application specific IC, and it's programming cannot be altered.

GPS, in any case, is not a good solution for what you are trying. Figure out how to use the accelerometers. Integrate their values to get speed.