Sonobuoys

Dear friends what a wonderful sim we have and the modders how can we thank them enough for all their wonderful work.i have been thinking about sonobuoys given that aircraft are our most dangerous enemy.would it be possible to mark active sonobuoys on the tactical map. Can sonar operators hear a passive sonobuoy drop and can they hear a hovering helicopter given the enemorious prop wash.I was a rad tech in RAAF so I'm no expert on sonar. Stay safe and good hunting