The windmill is shown on an historic chart and was used as a navigation mark by vessels.

Sources include:
Historic Admiralty Chart 1410_A1, RCAHMW digital collections sourced from the UK Hydrographic Office and published in 1842

Maritime Office, RCAHMW, September 2011.

'The stunted remains of a stone windmill tower located on a hillside behind a modern bungalow overlooking Milford Haven waterway. The interior is a single circular room 5.5m diameter, with walls 1.3m thick, & a small window opening on SE side. The first floor was formerly supported on 8 joists arranged east-west, and resting on top of two larger beams running north-to south.'
From notes written by Paul Davis in 1997.
RCAHMW 14th February 2020