Abbreviations

Question 1

What do the following mean?

Answer 1

OTC = Officer In Tactical Command 
ASWC = Anti-Submarine Warfare Commander 
SAU = Search and Attack Unit 
SAC = Scene of Action Commander 
AcPS = Action Picture Supervisor 
FOC = Furthest On Circle 
TDA = Torpedo Danger Area 
TDZ = Torpedo Danger Zone 
LLSUA = Limited Line Of Submerged Approach  
TCM = Torpedo Counter Measures

Question 2

What do the following codewords mean?

Answer 2

ASHCAN = HE Depth Charge
Bloodhound = ASW Torpedo
PONY = ASW Weapon Carrying HELO
BIG DIPPER = Radar + Sonar fitted HELO
LANCE SEARCHER = Active medium range or long range sonar
LANCE DIVER = Variable depth sonar
HOT = Sonar contact held
COLD = Sonar contact lost/not held
FEATHER = Visual Sighting of a periscope
RISER = Radar contact has suddenly appeared
SINKER = Radar contact has suddenly disappeared