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does google map navication follow a gpx route and give turn directions? obviously google's normal navigation will be less useful to @skinny in the transcontinental race
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OSMAND will follow a pre loaded gpx with voice guidance.
http://osmand.net/
Google Maps navigation is scarily good.
So good I don't even use a mount or screen. I just connect the bluetooth to the stereo in my car, put some music on, and let Google Maps reduce the volume to give me spoken directions.
And it hasn't failed me once.
Seriously, not a missed turning or anything.
And without having the screen on, I barely use a couple of % of battery in a 1 hour drive.
I can't recommend Google Maps highly enough for sat nav.