Well about this type of questions.
I use BGS online and atplonline.
In explanation in BGS online it says that I should appeal these questions, since it is actually part of Instruments exams. And not of GNAV.
So : Do these type of questions appear in the official CAA Exams? Because I will have my GNAV exam in 2,5 week and I dont want to waste time on things which will not be asked during exams.
Maybe you know it Paco? If you read this comment?