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[Page 5]
If you have the good fortune to trace an Opening, that leads into such a Water as we have above Described you will before you quit the stait remark well the Nature of it; whether it be so narrow, or the Navigation so difficult as to be susceptible of defence from Batteries on the Land: & if so you are to ascertain in a general way where according to the Nature position & direction of the Channel in your Idea such Defences should be placed. By the same Operation you will note the most secure & convenient places of Anchorage for yr Vessels.
Referring you to some General Orders Respecting the mode of Surveying, (which Orders are subjoined) we shall proceed to state our Ideas concerning the manner in which we expect the Intervals between the fixed Points, should be filled up; & your Manner of proceeding so as not to miss the openings in the Coast, whilst you may be sailing from Point to Point across a Deep Bay, or curvature of the Sands
I It is recommended that on all ordinary - occasions, the Brig [space] as requiring the least depth of water & being best calculated for working off shore, sails between you & yr Sand; by which means many Advantages will be gained she will be in the right Station for observing the openings in the Coast a constant look out for which as well as for all other interesting Objects should be kept at the Mast Head. Amongst other Advantages from this form of Sailings, is that of having a double Line of Soundings: & of increasing the Number of Bearings and Triangles.
Whenever an Opening is discover'd the Intelligence is to be Communicated by Signal & as Circumstances may require one of the Vessels may look into it