Welcome to the CPL Navigation question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.
Can i please confirm that when you pass over a station with VOR that the flag indicator doesnt actually change unless you tell it to with the OBS... I have attached a screenshot of two different paragraphs from the CPL nav book... i might be misunderstanding what it is actually saying.
Thank you Carello, so my understanding is in the first image the aircraft is on 180 radial tracking for 360 to the station.... second image is overhead the station and the third is on the 360 radial tracking 360 from the station.
If in the first image the aircraft turns to a heading of 180 immediately but does not change the OBS to read FROM 180.... the aircraft still assumes you are tracking 360... is this correct?.
Carello replied the topic: Passing over a station.
Yes, you are correct.
When the CDI is centred and the aircraft heading agrees with the OBS course (assuming nil drift), the TO/FROM flag will tell you if you are tracking TO or FROM the station - this is the VOR GOLDEN RULE
In pic' one, the your can turn onto any heading and the flag will continue to show "TO" because a track of 360 will take you "TO" the station.
Cheers Bob, I think i have a basic understanding of how it works, I should have enough to get me through the CPL exam questions. I think i will gain a better understanding once i actually start using it during the instrument rating.