Keep upto date and stay safe

Published 19:18 on 21 Jan 2026

To keep safe in the harbour… KEEP UP TO DATE WITH THE KHM Small Boat Channel Rules

Visit here for latest harbour news for leisure craft: https://www.royalnavy.mod.uk/khm/portsmouth/leisure Vessels under 20m in length are to use the Small Boat Channel when approaching the harbour entrance.

The Portsmouth Harbour entrance and main approach channel is considered a narrow channel in accordance with the International Regulations for Preventing Collisions and Sea (COLREGS) and as such, all mariners are reminded that in accordance with Rule 9(b) a vessel of less than 20 metres in length or a sailing vessel shall not impede the passage of a vessel that can safely navigate only within a narrow channel or fairway.

Shipping movements, tidal information etc are published daily via the Kings Harbour Master Webpage: https://www.royalnavy.mod.uk/khm/portsmouth

Should you wish to get in touch with the KHM then dont hesitate to contact the department via: portsmouth@khm.mod.uk or: Port Safety Officer Assistant, KHM Portsmouth, Room 404A, Semaphore Tower, HM Naval Base, Portsmouth, Hampshire, PO1 3LT.

Last updated 19:18 on 21 January 2026