Geometrical instruments – Miscellaneous – Light direction
Patent
1983-01-27
1985-02-19
Martin, Jr., William D.
Geometrical instruments
Miscellaneous
Light direction
33 1B, 33431, 33457, 33482, G01C 2120
Patent
active
044996659
ABSTRACT:
A novel course correction calculator, consisting of a sheet of transparent material 1 with inscribed reference line 2, centering points 3 and 4, radial lines 5 and 6, circular arcs 7 and circles 8, is provided whereby a heading correction and a speed correction factor for true speed can be obtained quickly and easily by a navigator for a small boat, vessel or aircraft, that offsets the effects caused by the motion of the medium through which the craft is traveling, such as tide or wind. The ratio of the speed of the medium to the speed of the craft through the medium and the direction in which the medium is moving are used with the invention to obtain a heading correction and a speed correction factor for true speed to offset the effects that the moving medium has on the path of travel for the craft. This invention provides a rugged, inexpensive, easy to use tool for the navigation of small boats, vessels and aircraft. The invention is of one piece construction, is easier to use, is independent of units used for speed, gives quicker results, and is more durable than prior art for determining these corrections.
REFERENCES:
patent: 1667191 (1928-04-01), Chapin
patent: 2004951 (1935-06-01), Jensen
patent: 2019708 (1935-11-01), Jones
patent: 2026537 (1936-01-01), Jensen
patent: 4138817 (1979-02-01), Frost et al.
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