I assume you would have tested this by now? I use the sport tracker on my N95. I found that the top speed and altitude values are flaky, and the export to google-earth is "rough" although good enough to record for your personal records. Having the phone shut does not maintain GPS connection well, so I am having trouble now using it as I stop wearing my jacket with summer approaching. Overall, its pretty decent (I have compared the mileage with
www.mapmyrun.com and its pretty accurate, and the mileage lap readings are pretty handy), and I will see if I am able to strap it to either my arm or belt, during the summer months (if anyone has any advice on this for a N95 that would be cool!

)
HTH
Mac