Need some help here... I am not electronically challenged, but have never been exposed to any GPS units. I want to get one, hand-held type so I can take it in the truck as well as the boat. What should I be looking for? What functions are available on today's GPS units? Easy to use? Looking for a mid-priced range one...don't need one that finds fish as I think I can outrun most of them

Any basic functions that are an absolute must? What about some additional "bells and whistles" that are nice to have, or a great addtion?

Thanks for all the advice,