Navigation system are well worth it, I went down to alton towers last year and was staying at a B&B down there, we didnt have a clue how to get there..
It was absoloutly slashing it down and windy as feck.. anyway I had taken my laptop + gps, we only took a wrong turning 2 times, and it was immediatly apparent when it happend.
I litterally said, we should be comming up on the b&b now, and just as I said it we drove past it.
There was no way we would have ever found it if it wasnt for the GPS. It was way out in the middle of nowhere with country back roads etc.
Well impressed, cause next morning we used it to get from the B&B to alton towers park.
Also on the way back or normal route was blocked by a fallen tree (it was that windy) and a quick look at the laptop and it had found an alternative route to bypass the blockage.
10/10 for the GPS on that trip.