The extremely dangerous Harbour Rock at the northern entrance to Valentia Harbour, was originally avoided by following the directional lights on the coast. Nowadays, the Harbour Rock is marked by a perch consisting of an iron pole, 12 metres high, painted black/yellow/black with east cones. This perch was lit on the 15th July 1991 with a character of Q(3)W 10 secs visible from 080° - 040° (230°).
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