This has turned out to be an excellent training thread and a picture is always worth a thousand words - thanks to flyingmac.
When all is said and done the message should be "let's make flying safer" so obtaining a good knowledge and understanding of all three methods is definitely the way to go. This thread has provoked a lot of interesting discussion both on line but also amongst professional colleagues and for that, I have really enjoyed the read.
Last edited by sapco2; 7th Feb 2014 at 15:36.