This chap spent twenty years translating it only to discover that the source text was useless. In 2017 he found that somebody else had done job – Geographia e codicibus recognovit, prolegomenis, annotatione, indicibus, ta… – Google Books The earliest useful found is the Geography of Claudius Ptolemy which mentions a promontory that seems to …
Some good eighteenth century detail on the area.
Deben and Orwell have Bloody Pint – King Alfred vs the Danes – Martellos – Stone Heaps
Available at David Rumsey Collection. Note Gunfleet, Walfleet, Easton Ness. also see 1683 Greenvile Collins chart of Harwich Haven – East Coast Curious
Squire Thornton Stratford Lecky , 1917 edition of Wrinkles, explains tides and instruments, lovely language.