212man: you'd be amazed to see how many line training captains and senior captains have absolutely no clue about this - in my experience though, and in fairness, those were mostly GOM pilots. One LTC told me with a dead serious face that I should trust him, because he had been involved in helideck certification and CAP437 supported his view - bit of Kafka moment there really. You'd be more forgiving with those who have never heard about CAP437, than those who pretend to know the content and yet have absolutely no idea of what it recommends.