Do you get SATNAV blind?

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Where you dont even look at the mpa before you leave for a long journey? You just simply follow the satnav? My dad said that he does this a lot, doesnt even bother with the map anymore, and 99% of the time it works! ... welll the though until the other day when he ended up 3 hours away from where he wanted to be! The satnav had for some reason taken him somewhere else! lol He only realised when he got to his 'destination' and it was a field, then he got out the map, and realised! lol ... I am very suprised the satnav is still in one piece! lol Also, do you ever shout at your satnav? if it tells you to go one way, and then you think, no i know its that way, and you are like you b*astard! lol Chris