Page "Anchor" Paragraph 41

These are used where the vessel is permanently or semi-permanently sited, for example in the case of lightvessels or channel marker buoys.

The anchor needs to hold the vessel in all weathers, including the most severe storm, but only occasionally, or never, needs to be lifted, only, for example, if the vessel is to be towed into port for maintenance.

An alternative to using an anchor under these circumstances may be to use a pile driven into the seabed.