Clearly my point was missed.
Make fun of my mistake if you wish, I certainly was very dirty with myself because of it. Yes it could have been discussed in training - but it wasn't, yes the captain could have interjected - but he didn't. Thankfully however, my employer did not see fit to crucify me for this mistake as some on this post would have it.
Ideally, someone who is now in the same role I was then, reads this post and might even learn from my mistake. Possibly someone very similar to yourself Amos, who will never made a mistake of their own to learn from.