Basic ASW Flashcards
List and state the ASW chain of command
OTC-ASW Commander-SAU Commander- (SAC) Scene of Action Commander
Ship’s ASW Team:
PWO, ASWD, AcPS, LAC
What is a Dogbox and what is its Radius/Time
Dogbox is an area in which a homing torpedo is active. 3000yds lasts 8 minutes
What is the furthest on circles (FOC)?
Visual circle of how far a submarine can travel from datum given the submarines course and speed.
What is the Torpedo Danger Area (TDA)?
An area which encompasses and extends beyond a submarine contact, threat datum, furthest on circle or area of uncertainty by a distance equal to the threat submarines Maximum Effective Torpedo Firing Range (METFR). This parameter is used by surface forces to maintain safe stand-off distances during ASW prosecutions and submarine avoidance actions
What is the Torpedo Danger Zone?
An area in which the submarine must enter in order to be within METFR. 8000yds Single Ship 10,000yds Convoy/Force
What is “Limited Lines of submerged approach”
Mathematically calculated limits related to a force, within an attacking submarine, knowing the course and speed of the force, must be calculated whether a submarine will be a threat to the force then it is possible to estimate these likely courses to achieve the aim.
What does it mean when a sub is “in the grain”?
An area between the LLSuA that the submarine is in, Submarine is on the MLA line and so won’t need to move to engage the force
What are some torpedo counter measures?
Changing course and speed
Deploying counter measures
Counter torpedo fire
Switch on/off noise makers
What are the two types of ASW action?
Close ASW action: The action in which one or more ASW units attempt to engage enemy submarine within 8,000yds. (TDA)
Stand-off ASW action: The action in which one or more ASW unit attempts to engage an enemy submarine outside of 8,000yds
Types of Contact Classification
Nonsub- Characteristics that exclude possibility of sub
PosSub- A contact which available information indicates the likely presence of a submarine, but there is insufficient evidence to justify a higher classification.
Must be amplified by a confidence level and number.
ProbSub- A contact that displays strong cumulative evidence of being a submarine (held on two or more sensors)
CertSub- A contact that has been sighted and positively identified as a submarine
List the Datum Approach Methods
Direct- straight for Datum
Offset- coming at datum from different angle
Intercept- intercepting sub on its most dangerous/likely course
Mixed- A mix of both intercept and offset using more than one ship
With aid of a diagram, explain Plan Cordon
Most commonly used search and attack plan.
Can be either a Plan Black or Red
Sector Zero- 3000yds
Ships remain outside sector zero unless cleared to enter
8 sectors of 45”, numbered 1-8, no outer limit
Plan orientated on North
Ships are not to manoeuvre within 500yds of sector boundaries in order to prevent mutual interference.
