[mookiemookie]

One tidbit I'd like to add....usually the hardest part of calculating a manual solution is getting the speed information. Once you have that for one of the ships in the convoy, you have it for all of them.

It just becomes a matter of selecting and identifying your targets, then all you really need to do to jump from one to the other is to take a stadimeter reading and get an AOB. You can do both fairly quickly.