Caernarfon Notice to Mariners 16/2021
Aid to navigation Llanddwyn Island “South West Rock” South Cardinal, Y.B is on its appropriate station, but is partially submerged.
Position: 53°07.81′ N 004°25.06′ W
Mariners are advised to exercise extreme caution in this area.
David John O’Neill
Harbwr Feistr Caernarfon Harbour Master