I'm using the TMO for SH4 1.4. Here is the link to it:
http://silenthunter.filefront.com/fi...aru_176;106067
I only use 1.4 because I have no desire to purchase or add the 1.5 U-boat add on. I get my U-boat fix by playing SH3. The above TMO link for 1.4 has the KAIBOKAN ESCORT in it, which is just a re-flagged US Evarts DE. I have compared the active and passive sonar (hydrophones) in the COKaibokan.SNS file and it looks just like the sensors on the Japanese DD/DE/CO .SNS files, probably just a cut and paste. As you have read above, I found out the Kaibokan Escorts (Evarts DE) did not ping me. I suspected it had something to do with the fact that in the game hardwire files, it's still being recognized as a friendly US DE and not programed to ping a friendly submarine. I copy/pasted the DE Evarts files from the SEA and ROSTER files and pasted them to a folder outside the SH4 files, then deleted them from the SH4 files. I thought this would force the game to recognize the Kaibokan Escort as a generic Japanese ship. When I went back to the scenarios where i added Kaibokan Escorts, they were missing! When I pasted the Evarts files back in the game files, the Kaibokans reappeared. So that to me, is proof the SH4 hardwired files still recognize the Evarts ship as a friendly US ship, regardless of what flag is flying from it's mast.