I just did a blind shot,in the fog surfaced, with radar and sonar but I didn't have this jewel available at the time ,.
http://www.subsim.com/radioroom/down...do=file&id=717 I'm using Claytons optical correction for 1.4,, I have put in the UPCData file from RFB 1.4 into Claytons optical correction,, I like it.