 In 1895 , a lighthouse was erected at Danger Point to warn shipping of the dangerous reef . The lighthouse is about 18 metres ( 59 ft ) tall and is visible for approximately 25 nautical miles ( 46 km ) . In 1936 , a remembrance plate for the Birkenhead was affixed to its base by the Navy League of South Africa . A new Birkenhead memorial was erected nearby in March 1995 . In December 2001 , the plaque was moved closer to the lighthouse . 
