Don't tell anyone - in case they want to come around and steal my car - but I've just won a Sat Nav system! (Handy hint - only enter competitions with good prizes but a likely low number of entrants. Focus your efforts.)
The good thing is there's a choice - either a TomTom One GB or a Navman F20.
But is there anything else I should be looking out for? Any usability tips from readers who have already played with the devices? Auto-replanning for wrong turns? What's with the Bluetooth of the TomTom One? Problems fitting them into Minis?
Despite being a gadget freak, I've long held off looking at GPSs since there's not much need for them in NI! But a free one could be useful for those random trips in hire cars from mainland airports to far flung offices and hard-to-find hotels. And for finding that short cut through Dee Street to the Odyssey.
December Update: Since it's Christmas, lots of people are googling for TomTom vs Navman and hitting this post. Yet it doesn't really answer the question in the post's title. So some further ramblings may help ...
The Navman F20 is being heavily promoted, but there are two aspects I dislike. Most importantly, it doesn't have good maps for Northern Ireland. Get a Garmin or a TomTom One Europe for good all-island Ireland maps. Secondly, as the salesman on Tottenham Court Road demonstrated, the usability is really poor too.
The Garmin units are pricey, but very easy to use. If you can afford one, I'd recommend them. The TomTom One's are cheaper - I got a TomTom One Europe in the end - and you get used to the idiosyncrasies in the interface after a while.
Hope this helps.