QUOTE (fike @ Oct 26 2009, 09:59 PM)

Motion X GPS for the iPhone works well, but it doesn't come close to matching some of the small hiking GPS that are out there.
Multitasking and Battery LifeIf you are running Motion X, you can't run anything else on the Iphone (no multitasking on iPhones) and your battery-life will be sucked down badly. I have run the iPhone down in 4 hours with the GPS running. That won't work for a full day of photo work or touring. My Garmin GPS batteries (2 x AA ) last about 12-18 hours.
Signal PerformanceiPhone GPS signal sensitivity is inferior to most handheld GPSes. I can put my Garmin eTrex Vista HCx in my camera bag on the floor of my backseat and it will track perfectly. With the iPhone, I can't even put it in my pocket and expect it to maintain a signal.
Usability and ConvenienceThe iPhone is great! motionX is great. It sends you an email with your tracklog file and a link to Google Maps that shows your path. Really Great!!
Here is a link to a hike I did last week.I tried Motion X during a fishing trip last weekend and you are absolutely right, the signal is really weak. Accuracy when Motion-X uses the phone network base station for positioning is not good. I need accuracy enough to tag buildings. And also, as you said, it really drains the battery fast. Judging from this experience it not a good solution for me. I guess I have to start looking at proper GPS equipment

//Anders