I found this map recently in a secondhand bookshop. It covers territory close to the fens in which I've set my latest novel,
Companion to Owls. It opens out longways for several metres, so I stretch it out on the floor - and it's printed on both sides. It was no longer in its original transparent wallet when I bought it, but inside the envelope it came in there were some typed notes with essential details for anyone navigating the Cam and the Ouse.
For example:
St. Neots Keeper Mr Davis, River Field Bungalow, St Neots, approximately 300 yards upstream on right bank.Approaching lock from downstream there is not much depth of water and boats should keep well to the left of the island. Boats can be tied up on the left of lock looking upstream if the gates are closed. There is limited depth of water over cill.There is also a set of instructions entitled
Passage Through Locks, the last one of which reads:
An average fee of 2/- each way seems to be usual for all these locks, but this is not an official toll. If a Keeper has to flood before craft can enter lock, it is suggested he be offered an increased fee.In
Companion to Owls, Mathieu, the son of a Huguenot family, becomes the sluice keeper at Stanground, near Peterborough, not so far from Huntingdon where this map was printed.
Let me know if you'd be interested in seeing a section of the map. Or if you know - or knew - Mr Davis of River Field Bungalow.