How can the required number of bower anchors and total length of cable be ascertained in IACS Unified Requirement UR A?

From a formula in IACS UR A, the ship’s Equipment Number is ascertained. With this Equipment Number, Table 1 is entered, and the required number and mass of anchors and the total length of anchor cable to be provided are determined.

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If Table 1 in IACS Unified Requirement UR A specifies that three stockless bower anchors are to be provided for a ship, why do most ships carry only two bower anchors?

Where can IACS-member classification society requirements for anchoring equipment be found?