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?

UR A, para. A1.4.2 provides that two of the three required bower anchors must be connected to their cables and positioned on board ready for use while the third anchor is intended as a spare anchor, installation on board not being compulsorily required. Each Classification Society is free to permit other arrangements at its discretion or not to require the spare anchor as a condition of classification.

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Which international convention regulates the use of anti-fouling systems?

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