Looking for a specific GPS.

If you don't put in a destination then my unit does not need to recalculate the route .
If I know the route I want to take then I see no need in putting anything in my GPS.
It will keep track of my miles my hours and all of those things without needing to be told where I am headed.

Now if I want it to put me on an address then I wait until I am close to the town I am going to then I will put in the address and then double check it and call to triple check it then and only then do I follow my GPS .