Re: PDA and heated screen
I use a Fortuna Clip-on GPS receiver with bluetooth to a HP2100 PDA.
In my RR Classic with a heated screen it will work sat on the dash,
but the signal strength is much better with the GPS tucked under the
sun-roof blind, where it fits very nicely, and has a better all round
view of the sky.
Most of the time on motorways you might not notice the difference, but
you will loose the signal earlier with the GPS on the dash when
conditions are bad, e.g. town centres or heavily wooded B roads.