Conwy Notice to Mariners 18/2026
All mariners are advised that Deganwy Marina channel lateral mark is unlit.
53° 17.37N 003° 49.80 W
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Category: Sailing
Conwy Notice to Mariners 17/2026
All mariners are advised that LNtM 16 of 2026 is now cancelled.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Caernarfon Notice to Mariners 22/2026
Aid to navigation Starboard “Traeth Gwyllt” Fl(2)G.10s is off station.
53° 09’.27 N 004°16’.09 W
It remains on an appropriate position.
53° 09’.36 N 004°15’.93 W
Mariners are advised to navigate with caution in this area.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 21/2026
Open Water Swim Event – Monday, 31st August, 2026.
An Open Water Swim Event will commence at 11:45 from Beaumaris Slipway and finish at Caernarfon Castle – ETA 15:30. Swimmers will be keeping to the Anglesey side and will cross over at Plas Newydd.
They will be accompanied by safety kayakers and powerboats.
Please exercise caution when navigating in the vicinity of the event.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 20/2026
Open Water Swim Event – Sunday, 30th August, 2026
An Open Water Swim Event will commence at 12:30 from Menai Bridge Slipway and finish at Y Felinheli Slipway – ETA 14:30. Swimmers will be keeping to the Anglesey side and will cross over at Plas Newydd.
They will be accompanied by safety kayakers and powerboats.
Please exercise caution when navigating in the vicinity of the event.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 19/2026
Open Water Swim Event – Saturday, 29th August, 2026.
An Open Water Swim Event will commence at 10:45 from Beaumaris Slipway and finish at Caernarfon Castle – ETA 14:30. Swimmers will be keeping to the Anglesey side and will cross over at Plas Newydd.
They will be accompanied by safety kayakers and powerboats.
Please exercise caution when navigating in the vicinity of the event.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 18/2026
Open Water Swim Event – Friday, 28th August, 2026.
An Open Water Swim Event will commence at 10:15 from Beaumaris Slipway and finish at Caernarfon Castle – ETA 14:00. Swimmers will be keeping to the Anglesey side and will cross over at Plas Newydd.
They will be accompanied by safety kayakers and powerboats.
Please exercise caution when navigating in the vicinity of the event.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Conwy Notice to Mariners 16/2026
All mariners are advised that the starboard green light on Deganwy marinas entrance gate is defective. All mariners should proceed through the entrance with extreme caution.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Caernarfon Notice to Mariners 17/2026
On Saturday the 15th and Sunday the 16th of August Caernarfon Harbour is hosting the annual OCRDA Powerboat racing.
Mariners are advised that there will be Powerboat and Jet ski racing in the area outside the River Seiont and Victoria Dock There will be potential delays in being able to navigate inbound and outbound of both the River Seiont and the Victoria Dock. Please be patient and follow the official’s requests.
Navigation inside the BLUE area is strictly prohibited during the racing times.
Please contact the Dock Master on VHF ch80 for further info on the race days.
Timings are subject to change at short notice
For course charts and further information, see Caernarfon Harbourmaster Notices to Mariners.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Conwy Notice to Mariners 15/2026
All mariners are advised that LNtM 12 of 2026 is now cancelled. The pontoon and buoy have been removed.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master