There is not supposed to be much Merchant traffic in that area at that time. You would see (maybe) some task forces come out of Davao Gulf and go west, or something come down through Sibutu Pass for the Makassar Strait, or Basilan Pass both directions, but mostly just airplanes until after Java, Timor and especially Rabaul fall. The date in your illustration is just a week after the first Timor landings. Parts of that force would have gone from Davao, down just the east of your current location in the Sangihe Pass to the Molucca Sea. Without radar at that time, it's kind of catch-as-catch-can... Unfortunately, you will might still see some mis-placed Allied traffic in the area, which has been rectified for the next release.
