Yesterday I completed my second mission with a IXB and RUB 1.43. I was very surprised for the map lacking some "useful" things, but I understand that a real kaleun didn't have the map update in real time
So now I have to understand more about my and target orientation and these make the game more attractive. Nice sounds, nice graphics, definitely a great mod. Very compatible and no problem at all. SH3 without RUB 1.43 is an arcade game. However, for a newbie is important to play without mods at first, then he can try to go in the fourth dimension.