Navigation aid with biangulation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 31, 1995
Grant Date -
N/A
app pub date -
Jul 8, 1994
filing date -
Jul 8, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A navigation device is disclosed, having a lens across an opening at one end of a case, and a compass across an opening at the opposite end of the case. A transparency holder is positioned between the lens and the compass, adapted to receive a map transparency with magnetic north thereon aligning with a north marking on the body of the compass, at a distance from the lens approximating the focal length of the lens. A first grid wheel is provided between the transparency holder and the compass, having a transparent or translucent central area inscribed with parallel grid lines and at least one first directional arrow aligned parallel to the grid lines, the grid wheel being in close proximity to the transparency holder such that it is also at a distance from the lens approximating the focal length of the lens. A second grid wheel is provided immediately adjacent the first grid wheel, and is releasably secured to the first grid wheel for normal rotation therewith, but is readily detachable therefrom for independent rotation. Positioned between the grid wheel and the compass, and geared to the grid wheel for counter-rotation therewith, is a direction wheel having a transparent or translucent central area inscribed with at least one second directional arrow.
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Cited Art Landscape
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