The Garmin GPSmap 276C is great. Fast computer, Large color screen, many functions. I use it mainly to record my rides and if I find some new roads, I'll know how to get back to them

Worked well to track my long distance rides as well and to find that gas station in the middle of nowhere.

You can hard wire the GPS to the bike (12V) but I use the lithium ion battery which gives me about 8 hours with the screen on full brightness. 2 batteries (with the screen on medium brightness) and I can do 24 hours.

You can get all the info & specs at garmin.com