Download PDF by N. Bowditch: American Practical Navigator

By N. Bowditch

Show description

Read Online or Download American Practical Navigator PDF

Best outdoor recreation books

Helen Tovey's Playing Outdoors: Spaces and Places, Risks and Challenge PDF

''For all contributors of the go away No baby within circulate who're engaged with early childhood—as educators, baby care services, nature middle employees, mom and dad, panorama designers, or pediatricians—this e-book is a necessary source. '' Louise Chawla, little ones and Nature community, united states What do young ones research via enjoying outdoor?

Download PDF by Justine Kerfoot: Woman of the Boundary Waters: Canoeing, Guiding, Mushing,

B/w photographic illustrations all through. The Boundary Waters quarter of Minnesota and Ontario is an enormous desolate tract of quiet attractiveness, enjoyed by means of many yet domestic for few. discovering it essential to adapt to year-round lifestyles at her mother's fledgling summer season inn, Justime was once faced with studying survival within the frigid north woods, a problem she met with verve; she recounts her reviews during this impressive e-book.

Hawke's Green Beret Survival Manual: Essential Strategies by Mykel Hawke PDF

Eco-friendly Beret and outside survival specialist Mykel Hawke presents the main functional and obtainable survival abilities and knowledge beneficial for a person to outlive an unforeseen scenario within the outdoor. those are the main tried-and-true equipment in response to Hawke’s 25- yr profession as a captain within the US military eco-friendly Berets, founding father of the survival education corporation Spec Ops Inc, and well known survival professional on a variety of tv exhibits.

Extra resources for American Practical Navigator

Example text

The map includes an area 500 miles on each side of the great circle. The limits of this map are indicated on the Mercator map of Figure 309c A cylindrical projection similar to the Mercator, but with uniform spacing of the parallels, is called a rectangular projection. It is convenient for graphically depicting information where distortion is not important. The principal navigational use of this projection is for the star chart of the Air Almanac, where positions of stars are plotted by rectangular coordinates representing declination (ordinate) and sidereal hour angle (abscissa).

The other parallels are concentric circles. The distance along any meridian between consecutive parallels is in correct relation to the distance on the earth, and, therefore, can be derived mathematically. The pole is represented by a circle (Figure 312b). The scale is correct along any meridian and along the standard parallel. All other parallels are too great in length, with the error increasing with increased distance from the standard parallel. Since the scale is not the same in all directions about every point, the projection is neither a conformal nor equal-area projection.

Figure 321. Polar stereographic projection. The polar azimuthal equidistant projection is useful for showing a large area such as a hemisphere because there is 34 NAUTICAL CHARTS no expansion along the meridians. However, the projection is not conformal and distances cannot be measured accurately in any but a north-south direction. Great circles other than the meridians differ somewhat from straight lines. The equator is a circle centered at the pole. The two projections most commonly used for polar charts are the modified Lambert conformal and the polar stereographic.

Download PDF sample

American Practical Navigator by N. Bowditch

by Anthony

Rated 4.39 of 5 – based on 16 votes