Sat Nav with programmable height?

[Sciroccology]

Are there any Sat Nav systems out there that;

a) Already have all the UK bridge heights programmed into them

and

b) Can be told the height of your vehicle ( 13' 6" ) and therefore be given a route avoiding anything lower?

Or am I asking too much?

>> Edited by Sciroccology on Wednesday 12th April 17:23