https://babel.hathitrust.org/cgi/pt?id=mdp.39015081885843&view=1up&seq=40 google version Buoys are Black Cones R or R/W cans
Estuarine
Google Books Has a good description of shoals. Shows SHMs such as Cutler being Red Cones. Some good Middle Ground Buoys at Gabbard. 19 feet into Harwich. Description of Deben. Submarine Bells
1915 USNO England East Coast Pilot Harwich extract
Thanks to https://thames.me.uk/sailing1817.htm and on Google \books THE SWIN AND KING’S CHANNEL Buoy on the Middle, No 3, black3 fathoms starboard. Whitaker Spit buoy, red, with staff and triangular vane3 fathoms larboard. South buoy of the Swin Spitway, blacklarboard. Gunfleet beaconlarboard. Gunfleet buoy, No. 9, black4 fathoms larboard. Middle hook […]
1817 Norie Sailing Directions Nore to Orfordness
Available as a book or on Google Books.
2004 The Essex Coastline then and now
On Google books Good description buoys and channels.
1844 The improved coaster’s guide, and Marine board examination, for ...
Chartlets from 2010 to 2019 no survey in 2020 due to COVID.
Deben Entrance year by year
Here
1752 Thames Chart
By Captain Washington. 1852 A new chart of the River Thames. With its entrances