I bought this app late this season and only got to try it at one track. It worked great other than finding a place to put my phone (my Sprint EVO 4G is a larger phone). The hump on the back of my Spidi suit unzips to hold a water container, so I dropped the phone back there. I liked that other than I couldn't get it back out myself without taking off the suit.
I bought an external Bluetooth GPS receiver and run it at the recommended 5Hz. I like creating my splits using Google Earth and then loading them on my phone.
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