Marc St. Hilaire Method: For Finding a Ship's Position at Sea

Front Cover
the author, 1919 - Navigation - 38 pages
0 Reviews

What people are saying - Write a review

We haven't found any reviews in the usual places.

Other editions - View all

Common terms and phrases

Popular passages

Page 4 - This enables obtaining latitude by the meridian observation and the ship's position by intersection of the Sumner lines. When the sun alone is visible it is necessary to make two observations with an interval of time. The point of intersection of two Sumner lines may be found by computation or by plotting on the chart, the latter being by far the more simple. Specially designed charts for plotting have the inconvenience, however, of being bulky; for example, to cover the latitude from the equator...
Page 19 - This academy is recognized as the oldest and best equipped Nautical school in the United States. It is up to date in every respect.
Page 4 - ... the former charts, and is therefore 50 per cent more efficient than the scale on the plotting chart published by the US Hydrographic Office. Captain Uttmark's chart may be used for plotting ship's position by any method using the Sumner lines.
Page 7 - ... Find the longitude at the time of taking the first observation using the latitude by account, and take from the tables the Azimuth corresponding to the hour angle found in the computation. On the chart lay down the position of the point given by the latitude by account and the longitude found. From this point draw a line in the direction of the Azimuth, then a line drawn through the point at right angles to the direction of the Azimuth is the first line of position. Find the longitude at the...
Page 13 - The mites or minutel of Latitude are to be taken from the corresponding Latitude scale on the is of the chart.

Bibliographic information