Originally Posted by
Dahon.Steve
However, there are no GPS units out there created for cyclist that use AA batteries and come with a large bright screens like one would use in a car. You can atach a car GPS to your handlebar and carry an external battery. The Montana is just way too expensive at the moment to even think about.
Attaching a car GPS to a bicycle is a horrible idea, they simply do not play nice when it rains because they are not one bit waterproof unless you get the units built for motorcycles. Plus they are much more wasteful on energy then a handheld unit.
Any Oregon series, Montana, Monterra, Etrex 20/30, or Dakota 20 will do what you want. Will auto-route, maps (free or paid).