I've have been through a couple Garmin Zumo units for the moto world. Last one is a Zumo 590LM. Big color screen. Could edit a map.ini file to change map colors. Works well for what it was designed for. Turn by turn works well enough on a very established trail system. Many of the places I ride are covered with a crisscross of trails. Trying to follow a track on the GPS I would go 30' past a fork then spend time messing with the unit to verify I was on the correct line. Silly when being on the exact trail doesn't matter. What I need is something with a satellite view to verify what drainage i'm in. Add a couple maritime units and Garmin has received enough on my money over the years. Just need a backup when I think I'm lost.

My question is for anyone who has mounted a smart phone to their bike. Did you have issues or no issues with vibration and shock from a rough ride? I may just go for it and report back of my experience. My phone is a couple years old and insured so noting to loose.