The Narrowness of the Channell here causeth the Tides both Flood and Ebb to run pretty strong, insomuch that you cannot Stem it without a fresh breeze of Wind, nor is it safe Anchoring because the bottom is foul and Rocky.

By keeping in the Middle of the Channell you will not only avoid being forced to come to an Anchor, but all other Dangers.

Being got within the entrance your Course up the Bay is North by West 1/2 West and North-North-West something more than one League; this brings you the length of the great Road, and North-West and West-North-West one league more carrys you the length of the Ilha dos Cobras, which lies before the City.

Keep the North side of this Island close on board and Anchor above it in 5 fathoms of water, where you see most Convenient before the Monastery of Benedictines, which stands upon a hill at the North-West End of the City.

Small Ships and Vessels generally lay between the Town and the Ilha dos Cobras, but in order to get there they must come round the North side of the Island.
I shall now give the best description I can of the Different Forts that are Erected for the Defence of the Bay.