I don't use a mounted GPS on my bikes. I just fish my phone out of a pocket at a stop for the rare times I want to see a map. But I have officially retired the marine chart plotter in our boat in favor of a waterproof 7" Android tablet running a $10 app. I have a different $10 app on my phone as backup. Garmin wants well over $1000 for a marine GPS with a decent sized screen and the same features. Right. I am into this tablet for less than $250 and the only feature lost is ability to see it in bright sunlight. My own experience with iPads is that they are pretty fragile. So far this Pantech Element has been unbreakable.
A man who can laugh, if only at himself, is never really miserable.