iphone GPS tracking, anyone?

[HillSlugger]

I have the iPhone 3G and installed iMapMyRide on it. My Garmin is preferable for many reasons:

- until they improve the iMapMyRide software, the phone must be actively "on"...and that's a major power drain on an already limited iPhone battery supply
- I have reason to believe (but do not know) that it uses cellular towers for positioning which may be challenging in rural areas
- the iPhone is large and probably not easily mountable on the handlebars for reference
- the iPhone is considerably more fragile than any alternative.

I think the idea is neat, but not "ready for prime time" in cycling yet.

IMHO

I carry my iPhone with me when I ride so it's pretty easy to just turn on one of these programs and give it a try. I've used Trail Guru and Every Trail and neither worked well with my older iPhone. I have "The Bike Computer" but when I tried to use it on Sunday it couldn't locate my starting point even though I had decent signal. I'd expect the new iPhone with GPS to work better, but I'm sure they've got a long way to go to match a Garmin.