For those using
RuB or the original
SonarDC Mod, I found a small buglet when creating SonarDC_20 in the original SonarDC Mod.
The Type 144A sonar was off by one hex space causing any DD carrying the Type 144A active sonar (usually Middle year '43 US DD) to still be at the default zero range detection. The fixed version puts it at 200 meters to lose lock like the rest of the sonars.
SonarDC_fix Mod
http://rapidshare.de/files/3066060/SonarDC_fix.zip.html
Type 144A active sonar was used around 1943 by one UK DD, and mostly US DD until about 1944 when replaced by the even better Type 147A.
EDIT IMPORTANT: Wrong file uploaded, please redownload. Darn, it is not my day...