I sent you a message. Remember with RSRD to think historic. If it works right the ships are there. I can stay in battle with large convoys or TF the first two years of the game.
Give me a date and I can send you somewhere to check. If you're in Fremantle, you've probably missed many of the large invasion forces coming to Java. There is a nice invasion group that heads to Christmas Island that you can ambush in the Sundra. I know it leaves through the Sundra late March, so you could probably sit in the Sundra March 25 and wait until it comes through..sit south.
I think it actually invades Christmas Islane March 31, but never looked for it there.
I sent you the Pacific animated link...your best friend with RSRD. Here is another good link, scroll down and look at the maps, many have dates. For instance the second map shows where the Jap carriers made their foray into the indian ocean in March..There's a great ambush spot above Timor, that might be close to your playing date.
http://www.ibiblio.org/hyperwar/AAF/...tml#appendix10
You could also go to data/campaigns and open each with the mission editor. I have never looked because I enjoy finding them, but I imagine it gives you a lot of exact info, just not sure how it works.