Better i write english, lol, my portuguese is very bad.
Any no-SS ship (FF,DD,CL,CV) for detecting subs needs 2 things:
1-A sonarman on the support slot (except FF and DD)
2-Have the overheat time barr full (that's not exactly the same than not overheating, it's more restrictive).
2 things more:
1-This work for surfaced SSs too (a surfaced SS with the overheat full can detect SSs).
2-A submerged SS is the only ship that can see SSs without the overheat barr full.
Plz translate it to portuguese ant put it clear.