Download American Practical Navigator by N. Bowditch PDF

By N. Bowditch

Show description

Read or Download American Practical Navigator PDF

Similar outdoor recreation books

Atlantic Salmon Flies and Fishing

A radical reference at the background and stories surrounding salmon fishing. broad info on salmon flies with various colour plates.

The Physics of Skiing: Skiing at the Triple Point

Meant for the final reader, snowboarding fanatic, and scientifically literate, this booklet covers the physics of snowboarding and the actual houses of traditional and man-made fabrics (i. e. snow and skis) with a lot cognizance paid to the dynamics of circulation. "The triple element" during this booklet has meanings: one being the purpose the place the 3 power states of water (solid, liquid, and vapour) coexist and which evidently is of detailed quandary to skiers.

Riis: Stages of Light and Dark

In 1996 Danish biking legend Bjarne Riis gained the journey de France. 11 years later he referred to as a press convention and confessed to taking performance-enhancing medicines which will in attaining the last word biking triumph. In Riis, his sensational autobiography - already an acclaimed bestseller in Denmark and Germany - the notoriously deepest Dane bares his soul.

Additional resources for American Practical Navigator

Example text

As in other azimuthal projections, Figure 317b. A stereographic map of the Western Hemisphere. great circles through the point of tangency appear as straight lines. Other circles such as meridians and parallels appear as either circles or arcs of circles. The principal navigational use of the stereographic projection is for charts of the polar regions and devices for mechanical or graphical solution of the navigational triangle. A Universal Polar Stereographic (UPS) grid, mathematically adjusted to the graticule, is used as a reference system.

Figure 326b. Part of a nautical chart made from the boat sheet of Figure 326a. Compare the number of soundings in the two figures. NAUTICAL CHARTS soundings taken in a thorough survey are shown on the chart, but sparse or unevenly distributed soundings indicate that the survey was probably not made in detail. See Figure 326a and Figure 326b Large blank areas or absence of depth contours generally indicate lack of soundings in the area. Operate in an area with sparse sounding data only if operationally required and then only with the most extreme caution.

335. Heights 337. Aids To Navigation The shoreline shown on charts is generally mean high water. A light’s height is usually reckoned from mean sea level. ) are usually reckoned from mean high water. A high water reference gives the mariner the minimum clearance expected. Since heights are usually reckoned from high water and depths from some form of low water, the reference levels are seldom the same. Except where the range of tide is very large, this is of little practical significance. 336. Dangers Dangers are shown by appropriate symbols, as indicat- Aids to navigation are shown by symbols listed in Sections P through S of Chart No.

Download PDF sample

Rated 5.00 of 5 – based on 4 votes