Thank you VERY much, Kapitan and John, for your very detailed answers. I really appreciate it.
I'm going to put your advice into a document and print it - it's very helpful.
Just for your interest, I uploaded the quick mission I made:
https://www.subsim.com/radioroom/dow...o=file&id=6071
(This is now the correct link)
See if you can send that LA to the briny deep!

Thanks for ALL your help,
Stew