28/05/2026
Caernarfon Notice to Mariners 04/2026
Mariners are advised of the current positions of the Aids to Navigation listed below.
CAERNARFON HARBOUR TRUST FLOATING AtoN POSITIONS DEPTH IN CHANNEL
Aid to NavigationApproximate Depth
(5 metres off correct side of AtoN, adjusted to CD).
WARNING: Depth will be affected by wind, atmospheric pressure and sea state.LatitudeLongitude LightLLANDDWYN ISLAND
SW ROCK BUOY
S CARDINAL 10.1m53ᵒ 07’.81 N004ᵒ25’.05 WUnlitLLANDDWYN ISLAND
NE ROCK BUOY
S CARDINAL2.67m53ᵒ 08’.04 N004ᵒ24’.47 WUnlitSAFE WATER MARK7.58m53ᵒ 06’.95N004ᵒ25'.14 WL Fl.10sC 1 STARBOARD 5.01m53ᵒ 07’.00 N004ᵒ24’.69 WFl.G.5sC 2 PORT0.51m53ᵒ 07’.19N004ᵒ24’.32 WFl.R.10sC 3 STARBOARD1.99m53ᵒ 07’.23 N004ᵒ 23’.88 WQ.GC 4 PORT2.43m53ᵒ 07’.12 N004ᵒ22’.74 WQ.RGRAMPIAN CASTLE
S CARDINAL1.33m53ᵒ 07’.26 N004ᵒ 22’.96 WVQ(6)+LFl.10sC 5 STARBOARD1.46m53ᵒ 07’.28 N004ᵒ23’.21 WFl.G(2).5sC 6 PORT2.78m53ᵒ 07’.16 N004ᵒ21’.97 WFl.R.5sMUSSEL BANK PERCH3.94m53ᵒ 07’.32 N004ᵒ20’.92 WFl.R(2).5sC 8 PORT1.78m53ᵒ 07’.63N004ᵒ19’.43 WFl.R.3sC 10 PORT2.48m53ᵒ 07’.95 N004ᵒ18’.20 WQ.RC 7 STARBOARD3.08m53ᵒ 08’.14 N004ᵒ17’.99 WQ.GC 12 PORT2.54m53ᵒ 08’.49 N004ᵒ17’.37 WFl(2)R.10sC 9 STARBOARD3.38m53ᵒ 08’.56 N004ᵒ16’.89 WFl.G.2sCHANGE BUOY
S CARDINAL3.95m53ᵒ 08’.80 N004ᵒ16’.74 WVQ(6)+LFl.10sSEIONT RIVER
BIFURCATION-1.06m53ᵒ 08’.54 N004ᵒ16’.82 WUnlitTRAETH GWYLLT
STARBOARD3.92m53ᵒ 09’.27 N004ᵒ16’.09 WFl(2)G.10sC 13 STARBOARD1.66m53ᵒ 09’.53 N004ᵒ15’.89 WFl(4)G.10sC 11 STARBOARD2.26m53ᵒ 09’.88 N004ᵒ15’.63 WFl(2)G.5sC 14 PORT4.81m53ᵒ 10’.18 N004ᵒ15’.53 WFl.R.5sC TEMP PORT4.97m53ᵒ 10’.53 N004ᵒ14’.67 WFL(2)R.5sC 9 STARBOARD
PORT DINORWIC2.76m53ᵒ 10'.63N004ᵒ13’.82WFL(3)G.10s
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master
Ymddiriedolaeth Harbwr Caernarfon Harbour Trust
Mariners are advised of the current positions of the Aids to Navigation listed below. CAERNARFON HARBOUR TRUST FLOATING AtoN POSITIONS DEPTH IN CHANNEL Aid to Navigation Approximate Depth (5 metres off correct side of AtoN, adjusted to CD). WARNING: Depth will be affected by wind, atmospheric pressu...