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I used to have an app called
MCN Ride Logger on my iPhone 3. Nice bit of kit, cost about a fiver. It logs your ride and gives you a dashboard with max speed, max accel/decel G, average speed and so on. Also it can display a map of your ride with the speeds and Gs for each section, and the usual time and distance information etc. It was fun to play with, but needed a bit more development, as an incoming phone call could switch it off in mid-ride, and sometimes it needed shutting down an re-starting when it froze. Downside (and this applies to any app that uses the GPS chip) is that it gets very hot in use and eats the battery alive, so it needs to be kept in a cool location and really needs a permanent 12v supply.
I upgraded to a iPhone 4 and the app was not compatible. I have not bothered replacing it with a newer version. Fun while it lasted, kind of thing.
There is a free satnav app called
NavFree which works well, but I think it needs a 3G connection to work, i.e. the maps are downloaded on the fly, not stored.
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