I hate satnavs!

I had a hospital appointment in Brighton today and although I knew roughly where to go I borrowed C's satnav for the final few miles.  Sadly it took me to the wrong hospital!  I did eventually find the right one but only with the help of 3 pedestrians.  I did check that I'd entered the right postcode (which I had) but it obviously had its own agenda.  It's now back in C's car - and in disgrace!!