Caernarfon Notice to Mariners 34/2025
Mariners are advised that the Swelly Rock South Cardinal is now lit.
53° 13’.16N – 04° 10’.45W
Notice to Mariners 33/2025 is hereby cancelled.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Category: Safety
Caernarfon Notice to Mariners 33/2025
Mariners are advised that the Swelly Rock South Cardinal is unlit.
53° 13’.16N – 04° 10’.45W
Mariners are advised to navigate with caution in this area.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Conwy Notice to Mariners 21/2025
All Mariners are advised that C2 top mark is missing and unlit.
A further notice will be issued once repaired.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Conwy Notice to Mariners 20/2025
All Mariners are advised that a dredging campaign at Conwy Marina will commence on the 10th of November 2025 under the Marine Licence DML 1833v3.
A further notice will be issued with the position of the special mark which marks the dredging pipe outfall, once laid.
Matthew Forbes
MSc LLB (hons) BSc AFNI
Conwy Harbour Master
Caernarfon Notice to Mariners 32/2025
Aid to navigation Fairway Buoy L FL10s is not on station.
53° 06’.95 N 004°25’.14 W
The Aid to navigation has been temporarily discontinued for the winter.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 31/2025
Aid to navigation Port No C8 Fl R 3s is on station.
53° 07’.63 N 004°19’.43 W
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 30/2025
Aid to navigation Starboard “Traeth Gwyllt” Fl(2)G.10s is on station.
53° 09.53 N 004°15.89 W
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners 29/2025
Aid to navigation Starboard “Traeth Gwyllt” Fl(2)G.10s is off station.
53° 09.53 N 004°15.89 W
Mariners are advised to navigate with caution in this area.
Jennifer Jones
Harbwr Feistr Cynorthwyol Caernarfon Assistant Harbour Master
Caernarfon Notice to Mariners 28/2025
Aid to navigation Port No C8 Fl R 3s is NOT on station.
53° 07’.63 N 004°19’.43 W
Mariners are advised to navigate with caution in this area
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Caernarfon Notice to Mariners – Buoy Depths Q4 2025
| Yellow Highlight = | Change of position since last |
| AtoN | Depth 5 Meters off correct side of AtoN e.g 1.5m @ 15:30 | Depth (m) Adjusted to CD | Latitude | Longitude | Light Characteristic |
|---|---|---|---|---|---|
| LLANDDWYN ISLAND SW ROCK BUOY S CARDINAL | 53°07.89’N | 004°25.15’W | Unlit | ||
| LLANDDWYN ISLAND E ROCK BUOY S CARDINAL | 53°08.04’N | 004°24.47’W | Unlit | ||
| SAFE WATER MARK | 15:56 | 7.32 | 53°06.96’N | 004°25.11’W | L Fl.10s |
| C 1 STARBOARD | 15:53 | 5.39 | 53°07.00’N | 004°24.69’W | Fl.G.5s |
| C 2 PORT | 15:49 | 0.65 | 53°07.13’N | 004°24.35’W | Fl.R.10s |
| C 3 STARBOARD | 15:45 | 2.50 | 53°07.23’N | 004°23.88’W | Q.G |
| C 4 PORT | 15:38 | 2.42 | 53°07.12’N | 004°22.74’W | Q.R |
| GRAMPIAN CASTLE SOUTH CARDINAL | 16:44 | 1.38 | 53°07.26’N | 004°22.96’W | VQ(6)+LFl.10s |
| C 5 STARBOARD | 15:41 | 1.54 | 53°07.19’N | 004°23.37’W | Fl.G(2).5s |
| C 6 PORT | 15:36 | 2.50 | 53°07.16’N | 004°21.97’W | Fl.R.5s |
| MUSSEL BANK PERCH | 17:14 | 3.84 | 53°07.32’N | 004°20.92’W | Fl.R(2).5s |
| C 8 PORT | 15:28 | 1.91 | 53°07.63’N | 004°19.43’W | Fl.R.3s |
| C 10 PORT | 15:21 | 3.32 | 53°07.95’N | 004°18.25’W | Q.R |
| C 7 STARBOARD | 15:19 | 2.80 | 53°08.13’N | 004°18.02’W | Q.G |
| C 12 PORT | 15:15 | 2.44 | 53°08.48’N | 004°17.39’W | Fl(2)R.10s |
| C 9 STARBOARD | 15:12 | 3.20 | 53°08.54’N | 004°16.91’W | Fl.G.2s |
| CHANGE BUOY S CARDINAL | 17:40 | 3.51 | 53°08.80’N | 004°16.74’W | VQ(6)+LFl.10s |
| SEIONT RIVER BIFURCATION | 15:08 | -0.56 | 53°08.55’N | 004°16.81’W | Unlit |
| TRAETH GWYLLT STARBOARD | 17:44 | 3.21 | 53°09.27’N | 004°16.09’W | Fl(2)G.10s |
| C 13 STARBOARD | 17:48 | 1.91 | 53°09.53’N | 004°15.89’W | Fl(4)G.10s |
| C 11 STARBOARD | 17:50 | 3.31 | 53°09.88’N | 004°15.63’W | Fl(2)G.5s |
| C 14 PORT | 17:54 | 6.31 | 53°10.23’N | 004°15.41’W | Fl.R.5s |
| C TEMP PORT | 18:00 | 5.00 | 53°10.53’N | 004°14.67’W | Fl(2)R.5s |
| PORT DINORWIC | – | – | 53°10.69’N | 004°13.81’W | Fl(3)G.10s |
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Ymddiriedolaeth Harbwr Caernarfon Harbour Trust