To me, "plotting a new route" means they are changing how they get from A to B.
I am a passenger in a car with a friend, carpooling to work. I say, "it looks like there is a wreck on the highway in a few miles, want me to find a new route to work?" That makes perfect sense. It doesn't matter if my friend and I have taken this alternate route before. It means we are changing our plan.
I am a passenger in a car with a friend, carpooling to work. I say, "it looks like there is a wreck on the highway in a few miles, want me to find a new route to work?" That makes perfect sense. It doesn't matter if my friend and I have taken this alternate route before. It means we are changing our plan.