I know it's hard to wrap your mind around how Android OS works if your a hardcore PC user. but its ok for a service to be running in android, Android actually even caches most of the main apps in RAM so they open faster, which is why clearing the ram with a memory optimizer app is a BAD idea unless your doing it right before opening a resource intensive game. look in the Battery Use screen, if maps isn't anywhere near the top, its not hurting anything by running. and it IS a nice app. however, if maps IS using majority of battery, then I see the validity in your concern and it would be alright to uninstall it completely