OK, when I am programming a route via sat nav it gives me red, blue and green options for each route. I'm guessing one is shortest, one is quickest and one is most economical (?) - is this right and which colour signifies which option!?!?!?

afaik it is just 3 route options. It is up to you which route you take looking at the time and mileage to work out the best route for you....Thats how i use it anyway!!

if you always want the fastest route, then you can set the preferences in the setup menu so it does not prompt you.