Caernarfon Notice to Mariners 24/2021
Aid to navigation Llanddwyn Island “South West Rock” South Cardinal, Y.B is off station.
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