Apologies, i didn't mean to come across as dismissive or rude towards asking a question. I am an ATPL student myself and have used this forum in the past for difficult concepts. It's just that there are many things in Gnav I would vouch for being difficult to 'click', but the stuff in the first post is not difficult at all for anybody who has opened the book/cbt and looked at the chapter in question. They're the types of questions of which there are numerous worked examples too, it just felt like they hadn't bothered to try look at it and understand and just wanted a quick answer was all.