Portable navigational instrument

Details Portable navigational instrument Portable navigational instrument

G - Physics

01

C

235/2

G01C 1/10 (2006.01) G01C 1/00 (2006.01) G01C 21/04 (2006.01)

Patent

CA 1051847

ABSTRACT OF THE DISCLOSURE A portable navigational instrument has edge portions which are adjusted so that the instrument's orientation with respect to a ves- sel can be maintained constant in different positions within the ves- sel'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.

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