Hi guys, I know this has probably been asked a million times, but....... Need to buy a sat nav pretty quick for new job on Monday and been looking at Garmin in particular - but - being a newbie to sat nav I can't seem to find enough info on the 3 models that I've narrowed it down to which are: 310d, 360t and the 610t in order to make an informed comparison. Can anyone please tell me the main differences between them e.g. the 610t is descibed as a stand alone GPS?? How are the maps updated and are the safety camera updates subscription based etc. etc. Any help and advise will be very much appreciated - thanks.