BTW if anybody wants cheap Sat Nav, this is how I did it!
1 x Road Angel (£250 off Ebay)
1 x PC Nav S/W (£50 off web) (has to be compatible with Road Angel)
1 x Radar Detector Add-in for Road Angel (£40)
Total cost £340 for GPS Camera Detection, Radar Detection and Satellite Navigation! The Nav s/w talks to you (used it to get through central Birmingham and it didn't get me lost once!) It's not as good as auto-route and not as good as full on integrated sat-nav, for for the price it's great!
(only if you have a laptop though!)