Navigational instruments

Details Navigational instruments Navigational instruments

1976-01-23

1977-11-15

Stephan, Steven L.

Geometrical instruments

Straight-line light ray type

Multisight line

33274, 33285, G01C 100, G01C 2100

Patent

active

040579069

ABSTRACT:
A portable navigational instrument has edge portions which are adjusted so that the instrument's orientation with respect to a vessel can be maintained constant in different positions within the vessel's wheelhouse. Bearings of objects are determined by a sighting arrangement which co-operates with a scale which is set in accordance with the vessel's steering compass bearing, corrected for deviation, whereby the need for a compass on the instrument is avoided. The sighting arrangement can comprise a single visible sight, and/or three such sights enabling horizontal angles between objects to be determined from a further scale, and/or a radio direction finding aerial.

REFERENCES:
patent: 1393891 (1921-10-01), Hansen
patent: 2328517 (1943-08-01), Van Opel
patent: 2697234 (1954-12-01), Sturdevant

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