Originally Posted by
Steve B.
You can, in theory, download and cache Google map segments on the phone. So no data required as along as you are riding in the area the cached map covers. Never done it, I just use a Garmin.
Yes yes. Maps can be used offline. And they are getting better - it is now possible to generate a car route offline. Caveats are that routes cannot be modified. Nor can you generate a course for bicycle or pedestrian travel.