Marine navigational protractor

Details Marine navigational protractor Marine navigational protractor

1975-12-08

1978-08-01

Aegerter, Richard E.

Geometrical instruments

Miscellaneous

Light direction

33 1N, 33109, G01C 2100

Patent

active

041034252

ABSTRACT:
A transparent plastic marine navigational protractor (chart overlay) which provides position from crossed bearings, new course to destination, course correction for drift, computation of estimated time of arrival, direct reading (conversion without reference to separate tables) of magnetic and steering compass equivalents of true geographic directions, continuous readout of dead reckoning and estimated positions, along with solutions to other relative motion problems, all without drawing any lines or resorting to the use of separate computer or scratch pad, and by using only one hand.

REFERENCES:
patent: 127949 (1872-06-01), Batchelder
patent: 1245304 (1917-11-01), Zona
patent: 2415277 (1947-02-01), Caston
patent: 2717448 (1955-09-01), Lubin et al.
patent: 3496640 (1970-02-01), Warner
patent: 3611574 (1971-10-01), Young et al.

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