At the commencement of the 6 fathoms, you will make the Point of Santiago of Ensenada to the S.W. of the compass.
This same depth of water continues, until you find yourself N. & S. with the Point or Cape Lara. Keep always steering to the W. of the compass, as before mentioned, and the soundings will diminish to 3 fathoms. If, during this passage, the river ebbed, you would have 3 fathoms from the Village des Quilmes.
By the course, and the differences of soundings above-mentioned, you will be able to navigate by night, or when the weather will not permit you to make out the marks.
Between the two Buoys which are placed to the N.W. of the Bank Chico and Ortiz, you will find 5½ and 6 fathoms, according as the river is high or low.
Between the Banks Chico and Ortiz, the anchorage is good, and the anchors hold tolerably well.
In the environs of the Bank Ortiz, vessels are less subject to part from their anchors, because the bottom is mud and sand.
From the Cape Indian to Buenos Ayres, the currents flow from the E.S.E. to the W.N.W.; their rapidity is much about from 1½ to 2 miles an hour.
In tacking, when the wind is contrary, a great deal of way can be made by means of the currents.
From the S.E. extremity of the Bank Ortiz, to the S.E. extremity of the Bank Chico, as you gradually proceed up the river, you will find yourself nearer the Bank Ortiz than the land; you will keep taking from 3 fathoms along the chain of rocks which run along the coast, until 3 short fathoms on the side of the Bank Ortiz. Observe, that during this tack, when you find yourself in 4 or 4½ fathoms, you are then nearer the bank than the land.
Having doubled the Bank Ortiz, you can safely proceed until you have 3 fathoms of water; for the depth diminishes gradually.