Anchoring is an operation on board that involves dropping a metallic object with “claws”, called the anchor, which is attached to a chain connected to the ship. Safe and proper anchoring maintains the ship’s anchor fittings in good order. Additionally, it keeps her steady in a particular area...
https://www.seamanmemories.com/safe-anchoring-techniques-bridge-team-anchor-party/
Meeting in very narrow channels takes special procedures whereby each vessel is on a steady course and almost pointed at the other, says a recent Nautical Institute report.
Deviations caused by the vesselWhile rounding the curve, the up-bound vessel proceeded close to the north bank and then deviated towards the centre of the canal, as shown in A.
Meanwhile, the down-bound vessel approached the curve at a speed of 4.9 knots.
To correct the deviation, the bridge team altered the course to starboard...
https://mfame.guru/importance-of-bow-pressure-waves-hydrodynamics-to-avoid-bottom-contact/