In tacking about between the Bank Chico and Ortiz, you can, as before said, run your tacks upon all the points of the Bank Ortiz as long as you are in 3 fathoms water. But in the tacks which you run upon the Bank Chico, you must put about ship as soon as the sounding line does not give you more than 4 fathoms, because this bank is full of pointed rocks, particularly at the place where the second buoy is placed, upon the point from the N.W. to the S.E.; it is also equally rocky from the first buoy to the S.E. as far as three miles to the W.N.W. because on the two points you find no more than 1½ fathom water. * * * * * POSITIONS of the TEN BUOYS placed on different Banks in the River Plate. _Upon the Bank Chico there are Four Red Buoys._ 1st. Is placed at the S.E. extremity of the Bank Chico, on a bottom of 3 fathoms. From this Point, you make the Magdalene Church at the S. 15° W. of the compass. 2d. Is placed at the S. extremity of the Bank, on a bottom of 3 fathoms. It is situated at the W. ¼ N.W. of the first, distant 4 miles: you make the Church, at 15° E. 3d. Is situated to the N. ¼ N.W. of the second, distant 4 miles, upon a bottom of 1½ fathom; it is in the middle of the Bank. You make the Point of Atalaya to the S.W. of the compass. 4th. Is placed at the N.W. extremity of the Bank, on a bottom of 3 fathoms, to the W.N.W. of the third, distant 4 miles. You make the Point of Atalaya to the S. 24° W. of the compass, distant 10½ miles. _Upon the Bank Ortiz are placed Four Black Buoys._ 1st. Is at the S.E. extremity of the Bank Ortiz, on a bottom of 3 fathoms. From the buoy, you make Cape Indian to the S.W. ¼ S. of the compass: you will, at the same time, see, from the deck of a vessel of an ordinary size, and on a clear day, the buoy, and the coast of Cape Indian. 2d. Is at the S. extremity of the Bank Ortiz, on a bottom of 3 fathoms, and to the N.N.E. of the buoy of the S.E. of the Bank Chico. 3d. Is placed upon the side of the Bank Ortiz, on a bottom of 3 fathoms, to the N.N.E. of the middle of the Bank Chico. 4th. Finds itself upon the Bank Ortiz, by 3 fathoms, and to the N. of the one of the N.W. of the Bank Chico. _To the Ensenada de Barragan, on the Banks of Santiago and Lara, are placed Two Black Buoys._ 1st. Black Buoy is upon the Bank of Santiago, in 3 fathoms: the bearing of this buoy has the Point of the Santiago to the S. 28° E. and Point Lara to the S. 53° W. of the compass. 2nd. Black Buoy is placed upon the Bank Lara, on a bottom of two fathoms, on the bearing of Point Lara to the S.E. ¼ S. and the Point of Santiago to the S. 63° E. These two buoys are placed to warn Navigators to pass to the Northward. _Observations._ The Bank Chico is not parallel with the S. coast, because, from the first buoy of S.E. you take the bearing of the third buoy to the N. 42° W. of the compass. This bank is nine miles in length.