Africa Pilot: comprises the sailing directions of the southwest coast of Africa from Cape Palmas to the Cape of Good Hope, including the islands of St. Helen, Ascension, Tristan da Cunha, and neighboring islands

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U.S. Government Printing Office, 1916
 

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Seite 59 - Pilot vessels, when engaged on their station on pilotage duty, shall not show the lights required for other vessels, but shall carry a white light at the masthead, visible all round the horizon, and shall also exhibit a flare-up light or flare-up lights at short intervals, which shall never exceed fifteen minutes.
Seite 59 - On the near approach of or to other vessels they shall have their side-lights lighted, ready for use, and shall flash or show them at short intervals, to indicate the direction in which they are heading...
Seite 59 - A pilot vessel of such a class as to be obliged to go alongside of a vessel to put a pilot on board may show the white light instead of carrying it at the masthead, and may, instead of the colored lights above mentioned, have at hand, ready for use, a lantern with a green glass on the one side and a red glass on the other, to be used as prescribed above.
Seite 10 - ... the fixed arm. To plot a position, the two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass respectively and simultaneously through the three objects. The center of the instrument will then mark the ship's position, which may be pricked on the chart or marked with a pencil point through the center hole. The transparent xylonite protractor is an excellent substitute for the brass.
Seite 12 - The ordinary form of it, the so-called "bow and beam bearing," the distance from the object at the latter position being the distance run between the times of taking the two bearings, gives the maximum of accuracy, and is an excellent fix for a departure, but does not insure safety, as the object observed and any dangers off it are abeam before the position is obtained. By taking the bearings at two points and four points on the bow, a fair position is obtained before the object is passed, the distance...
Seite 4 - Isolated soundings, shoaler than surrounding depths, should always be avoided, especially if ringed around, as it is doubtful how closely the spot may have been examined and whether the least depth has been found. The chart on largest scale should always be used on account of its greater detail and the greater accuracy with which positions may be plotted on it. Caution in using small-scale charts. — In approaching the land or dangerous banks, regard must always be had to the scale of the chart...
Seite 59 - ... the horizon and of such a character as to be visible on a dark night with a clear atmosphere at a distance of at least two miles, and also the colored side lights required to be carried by vessels when under way.
Seite 17 - The gradual change in the variation must not be forgotten in laying down positions by bearing on charts. The magnetic compasses placed on the charts for the purpose of facilitating plotting become in time slightly in error, and in some cases, such as with small scales, or when the lines are long, the displacement of position from neglect of this change may be of importance. The compasses are...
Seite 5 - Ah1 the distances given in the Light Lists and on the charts for the visibility of lights are calculated for a height of 15 feet for the observer's eye. The...
Seite 11 - It is not intended that the use of the compass to fix the ship should be given up : there are many circumstances in which it may be usefully employed, but errors more readily creep into a position so fixed.

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