Conwy Notice to Mariners 17/2025
All mariners are advised that Local Notice to Mariners 14/2025 & 15/2025 are hereby cancelled.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Category: Notices to Mariners
Conwy Notice to Mariners 16/2025
All mariners are advised that the special mark for the long sea outfall pipe at West Shore Llandudno is partially submerged or fully submerged at certain states of tide.
053°19.803N 003°53.886W
All mariners are advised to navigate with caution in the area.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Caernarfon Notice to Mariners 22/2025
Aid to Navigation Aber Menai Point is on station and showing it’s appropriate lights.
The land marks position is 53°7.619 N 004°19.715 W
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 20/2025
Aid to Navigation Aber Menai Point is not on station.
The charted position is 53° 7.619 N 004° 19.715 W
Mariners are advised to navigate with caution in this area.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 19/2025
Mariners are advised of the current positions of the Aids to Navigation listed below.
| Yellow Highlight = | Change of position since last |
| Aid to Navigation | Depth (5 metres off correct side of AtoN, adjusted to CD). | Latitude | Longitude | Light |
|---|---|---|---|---|
| LLANDDWYN ISLAND SW ROCK BUOY S CARDINAL | 8.5m | 53ᵒ 07’.89 N | 004ᵒ25’.15 W | Unlit |
| LLANDDWYN ISLAND NE ROCK BUOY S CARDINAL | 2.02m | 53ᵒ 08’.04 N | 004ᵒ24’.47 W | Unlit |
| SAFE WATER MARK | 7.64m | 53ᵒ 06’.95 N | 004ᵒ25′.14 W | L Fl.10s |
| C 1 STARBOARD | 5.38m | 53ᵒ 06’.96 N | 004ᵒ24’.71 W | Fl.G.5s |
| C 2 PORT | 0.34m | 53ᵒ 07’.12N | 004ᵒ24’.71 W | Fl.R.10s |
| C 3 STARBOARD | 1.7m | 53ᵒ 07’.23 N | 004ᵒ 23’.88 W | Q.G |
| C 4 PORT | 1.8m | 53ᵒ 07’.12 N | 004ᵒ22’.72 W | Q.R |
| GRAMPIAN CASTLE S CARDINAL | N/A | 53ᵒ 07’.26 N | 004ᵒ 22’.96 W | VQ(6)+LFl.10s |
| C 5 STARBOARD | 1.93m | 53ᵒ 07’.19 N | 004ᵒ23’.37 W | Fl.G(2).5s |
| C 6 PORT | 2.3m | 53ᵒ 07’.16 N | 004ᵒ21’.91 W | Fl.R.5s |
| MUSSEL BANK PERCH | 5.59m | 53ᵒ 07’.32 N | 004ᵒ20’.92 W | Fl.R(2).5s |
| C 8 PORT | 3.76m | 53ᵒ 07’.63N | 004ᵒ19’.43 W | Fl.R.3s |
| C 10 PORT | 2.1m | 53ᵒ 07’.95 N | 004ᵒ18’.22 W | Q.R |
| C 7 STARBOARD | 2.3m | 53ᵒ 08’.14 N | 004ᵒ18’.13 W | Q.G |
| C 12 PORT | 3.03m | 53ᵒ 08’.50 N | 004ᵒ17’.38 W | Fl(2)R.10s |
| C 9 STARBOARD | 3.58m | 53ᵒ 08’.57 N | 004ᵒ16’.88 W | Fl.G.2s |
| CHANGE BUOY S CARDINAL | 2.19m on station 6.09m in channel | 53ᵒ 08’.81 N | 004ᵒ16’.72 W | VQ(6)+LFl.10s |
| SEIONT RIVER BIFURCATION | -1.21m | 53ᵒ 08’.55 N | 004ᵒ16’.79 W | Unlit |
| TRAETH GWYLLT STARBOARD | 6.04m | 53ᵒ 09’.29 N | 004ᵒ16’.08 W | Fl(2)G.10s |
| C 13 STARBOARD | 3.74m | 53ᵒ 09’.54 N | 004ᵒ15’.89 W | Fl(4)G.10s |
| C 11 STARBOARD | 4.2m | 53ᵒ 09’.88 N | 004ᵒ15’.63 W | Fl(2)G.5s |
| C 14 PORT | 7.38m | 53ᵒ 10’.23 N | 004ᵒ15’.41 W | Fl.R.5s |
| C TEMP | 53ᵒ 10’.53 N | 004ᵒ14’.67 W | FL(2)R.5s | |
| C 9 STARBOARD PORT DINORWIC | 1.29m | 53ᵒ 10.69 N | 004ᵒ13’.81 W | FL(3)G.10s |
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Conwy Notice to Mariners 15/2025
Notice of Commencement of Works- Oyster deployment
Wild Oysters: Conwy Bay Project – Native oyster (Ostrea edulis) Habitat Restoration, Conwy Bay.
The deposit of native oysters, Ostrea edulis for Wild Oysters: Conwy Bay Project is due to take place between 17 June 2025 until 24 June 2025. The works will involve depositing oysters on the seabed undertaken by the Conwy Harbour Authority, using the vessel Jac-Y-Do. Temporary buoys will be in place to aid deployment within the site. It should be noted that these are not for any navigational warning purposes.
See the attached document for more information.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Conwy Notice to Mariners 14/2025
All mariners are advised that 4 orange buoys will be positioned in Conwy bay to aid in the cultch deployment for the Bangor University oyster regeneration project. Please see attached detailed information of the planned cultch deployment works issued by Bangor University.
Works are scheduled to commence on the 9 th June 2025 for a period of 20 days.
A further notification will be issued on completion of the Cultch deployment.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Caernarfon Notice to Mariners 18/2025
Three Seasonal Race Marks have been established in the following positions.
- PDSC 3 – 53 ̊ 10.87N 004 ̊ 13. 47W
- PDSC 4 – 53 ̊ 11.11N 004 ̊ 13. 09W
- PDSC 5 – 53 ̊ 11.32N 004 ̊ 12. 93W
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 17/2025
Temporary Aid to navigation Port “T” Fl (2) R 5s is now on station in the position below.
53°10’.53 N 004°14’.55 W
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 16/2025
The Aber bridge is now operational.
Notice to Mariners 15/2025 is hereby cancelled.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master