You are, of course, right about Q120
. I also got very confused with the other questions you mention, but a session with my instructor helped me to get my head round it all (still not sure that some of it isn't a bit off the mark?!). Not easy for someone who couldn't pass maths at school! Passed the Nav exam tho
. Glad thats over! Good luck with yours. Watch out for mistakes in some of the other sections too.