In a previous article, "William Bruce" said:
I've just bought a TomTom GPS for my car with preloaded road maps of the US
and Canada. My question: Will it work in my 172 at 3,000 to 5,000 feet,
showing the roads below, etc?

There was a time when Garmin GPSes meant for terrestrial use would cut out
at around 100mph, which limited their usefulness for aviation. But that
was a long time ago. It's doubtful that TomTom did that same stupid
thing.

There is an on-line book at http://www.cockpitgps.com/ that has some
information about using non-aviation GPS in aviation.

--
Paul Tomblin http://blog.xcski.com/
I wouldn't be surprised if I'd have to put garlic in the CD drawer
to really get rid of it.
-- Arthur van der Harg on 'Gator'