When reading maps "upside down," the impression given is that NCF appears not to recognise that North become South and just as important, West becomes East - hence elaboration of the mistake made twixt path and canal.
The positioning of the dialogue in the piece regarding the proposed "works" is also interesting. It might suggest that they are to occur within the area of the features identified by the trio. Research indicates that their location is elsewhere - not within the city - in fact - not even close!
Even in what may seem "straightforward" offerings, Mr F appears to endorse the words of Sir Walter Scott, (who featured not that long ago), - "tangled webs, weaving and deceiving et al!"