Fishing Equipment Store

What is the best GPS unit to use for both fishing and car travel?

I know very little about GPS units. I would like to use the GPS to return to my fishing spots on 2-3 lakes I fish frequently. I know some units can download maps of most larger lakes. Is it better to use this type of unit to find my spots? I would also like a unit portable enough to use in my car when I travel. Is there a unit or unit type that would satisfy both applications? Any advice would be greatly appreciated. Thank You

The best is Garman, it is light weight and easy to use.

Growing Up in a Fishing Family by Leo Massey (a digital story from the Lake Illawarra MAP Project)