Anchoring.
When anchoring it is easy to damage a hanked-on headsail or make it dirty with mud from the anchor chain.
To avoid this and to improve forward visibility on the approach to the anchorage, the tack of the sail should be released and the genoa halyard can be clipped to it.
If the halyard is then raised the foot of the sail can be hoisted clear of the area where it can be damaged.
The added bonus is that the helm can see below the sail and clear any obstructions.
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