No Possible Routes

In Northern Ireland this week and greeted one morning by a SAT NAV first:

Programmed in origin & destination, route calculated, then it announced "No Possible Routes" (whilst displaying the route).

Choices:
a) sit there in the hotel carpark for the day, accepting the pronouncements of the authority voice
b) press on into the unknown, cutting my own route down the A24, regardless of the offical line of "No Possible Routes"

Mindsets summed up. Are you a No Routes Possible believer or doubter? Just because someone says it can't be done, do you believe them or do you go and find out for yourself? Just because the 21st C demands different skills and attitudes to the 19th, do you freeze at "no possible routes" or cut your own path....finding the possible routes in the blank, SAT NAV landscape....