The Princess Royal will visit the Essex base of Trinity House today. She'll meet local officials and tour the offices and buoy yard at Harwich Quay.
The Princess, is Master of the lighthouse authority - these days a largely honorary post.
Past Masters have included Samuel Pepys and the Duke of Wellington
The Princess Royal has arrived in Chelmsford to attend a service remembering those who were killed in the flooding of 1953.
95 people were killed in Essex when the floods struck 60 years ago today.
The Princess Royal has been in Newmarket to open a new housing development. The 16 affordable apartments have been built by the Racing Welfare charity which looks after retired jockeys and stablehands.