In reply to digby:
Garmin in car satnavs are astoundingly bad compared to TomTom.
The faults with my girlfriends Garmin (not including the issues with their awful maps which are worth a separate rant):
It gets left and right confused - Seriously! I can't even start to figure out how this happens but it happened several times on a recent trip to France and occasionally throws a fit near the A5 in North Wales.
It suffers from lag, meaning it can be several junctions behind your real position when driving in towns.
It drops signals with amazing regularity, when my tomtom and 2 smartphones both had good coverage (yes I'm sad enough to have compared 4 different satnav systems at once).
The display is rotten, their designers need to go back to school and learn about things like perspective. You can't tell the difference between a hairpin and a straight!
Lane guidance is non-existant, unlike my TomTom that was a cheap model 2 years earlier.
It has advanced traffic warnings unfortunately the calculations it does with this information have more in common with Bistromaths than actual numbers. (
http://hitchhikers.wikia.com/wiki/Bistromathics ) For instance a 40 minute delay on the M1 recently took over an hour off our arrival time?!?!?
Basically don't buy a Garmin satnav, you'd be better off drawing maps on beer mats.