1790 Stanier Thames Estuary on wikimedia has drawings of beacons and buoys as well as tidal data. A lovely chart.
Image Credits and Sources
- Chart_of_the_River_Thames_from_London_to_the_Nore_Margate_and_the_Downs_North_Middle_and_South_Channels_from_a_survey_taken_in_1789_and_90_RMG_F0204-smaller: Richard Stanier, Public domain, via Wikimedia Commons | Public Domain Mark 1.0