The western one of a pair (see NPRN 525091) of navigation markers located on the cliffs on either side of the entrance to Porthgain Harbour. Unlike the eastern marker, the western marker is not designated as a listed building. The marker is shown on the 1st Edition 25" OS map, published in 1889. As such, it is assumed to be associated with the first phase of harbour construction at Porthgain, which took place in 1851.

The navigation marker has a square base tapering on all four sides to a flat top and sites on a square plinth. It is constructed from whitewashed rubble and measures 1.7m across its base, and stands c. 4.6m in height.

The marker was recorded with a photogrammetry survey (links below) undertaken by RCAHMW on 30/06/2023 as part of the Pembrokeshire Coastal Survey Project, in collaboration with the Centre for Maritime Archaeology at the University of Southampton. 

Sources include:

Dyfed Archaeological Trust HER PRN 24723 https://archwilio.org.uk/her/chi3/report/page.php?watprn=DAT24723

OS 1st edition 25in mapping

National Trust report "Ynys Barri" 1989

RCAHMW Photogrammetry Survey, PGS2023_019, 30/06/2023. View here: https://skfb.ly/oIVOy

J. Whitewright, RCAHMW, July 2023