Navman 450 problem?

I cannot navigate anywhere as when entering a postcode or address I get a message saying "A route cannot be calculated to your destination. Please check your routing preferences and try again"
Driving me potty (no pun intended) (Well maybe just a little pun eh?)
My preferences have just ticked some warn me boxes if I'm looking at the right screen??

Any help/ advice much appreciated.

Cheers

Andy