Why are sat-nav walking directions always so hopeless?

I'm a nonentity, get me out of here

Something for the Weekend, Sir? I stumble on a large root. At least that's what I think it is. For all I know, it could be a low fence, a rotting corpse or a very hardy badger. Some dodgy software has led me here, maybe some even dodgier software is waiting to mug me behind the next tree."