This happened a few years ago. I live in Alicate, in Spain and my husband and I had rented a house in Galicia for the summer holiday. We were going to first drive to Tarragona, to stay for a few days with some friends, and then drive from Tarragona to Galicia.
The first part of the journey was fine. We were using our new satnav for the first time, and it took us right to the door of out friends' house. Three days later, when we continued our journey, we put in the name of the small town in Galicia, Nigran, which was our final destination. We started off, obediently following the instructions, but after a while we realized that instead of driving west towards Lerida, we were going north. in fact, soon we were quite near Andorra. I was sure we were going in the wrong direction, but my husband wanted to do what the satnav was telling us - it was his new toy! It was only when we started seeing mountains that even he admitted this couldn't be the right way. so we stopped, got out an old map, and then turned round! We had wastd nearly two hours going in the wrong direction!
It was an awful journey because as well as getting lost, when we were nearly at our destination we had another problem. We stopped for a coffee at a little bar, but as soon as we got back onto the motorway we realized that we had left our dog under the table in the cafe! For the second time that day we had to turn round and go back. Luckily, the dog was still there! However, althought the beginning of our trip was a disaster, we had a wonderful holiday!