In my Teutonic Tank we have choices:
C1. No electronic options, I make all the routing decisions based on memory dump. This is known as PratNav
C2. Built in system which modifies national borders at will and insists "Turn right" followed closely by "YOU VILL TURN RIGHT!!" Known as NazNav.
and
C3. An aged TomTom with HM the Q installed as the `voice`. This is the preferred option as its the only voice my good lady will not argue with...
