** There is an additional 1 penetration if the depth charge is equipped on a [[:Category:Destroyer_Escorts|destroyer escort]].
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** The formula is <math>\text{Pen}_\text{DC} = \sqrt{\text{ASW}_\text{equip}-2} + \text{Mod}_\text{ship}</math>
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Therefore, the '''maximum armour value''' <math>\text{HP}_\text{current} \times 1.3 - 0.6</math> and the '''minimum armour value''' is <math>\text{HP}_\text{current} \times 0.7</math>. This makes the maximum defensive power a target can have is '''1.3x''' armour and the lowest is '''0.7x''' armour.
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Therefore, the '''maximum armour value''' <math>\text{Armour} \times 1.3 - 0.6</math> and the '''minimum armour value''' is <math>\text{Armour} \times 0.7</math>. This makes the maximum defensive power a target can have is '''1.3x''' armour and the lowest is '''0.7x''' armour.