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Try Bike On - Voice navigation for bikers https://itunes.apple.com/us/app/bike-on-bicycle-routes-maps/id640958131?mt=8

Just verified that the 510 can be attached to power while on/in use. It continues to operate. When the external power source is removed, it will give a message to that effect, but does not power down (like the nuvi/car versions do). Note that you (obviously) have to open the weather seal to plug in power. Also worth noting, the 510 will go into a different ...

I am planning a cycle tour this Spring from Dieppe to Paris and want to use a GPS to navigate. I wasn't sure whether to use my iPhone or my Garmin eTrex 20. The eTrex 20 is a mid-range unit with a colour screen and you can transfer maps to it through a microSD card. In the end the eTrex 20 won out: Compared to an iPhone it is extremely rugged. My iPhone ...