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专利名称：Navigational instruments发明人：Richard Creighton King申请号：US05/651621申请日：19760123公开号：US04057906A公开日：19771115
摘要：A portable navigational instrument has edge portions which are adjusted sothat the instrument's orientation with respect to a vessel can be maintained constant indifferent positions within the vessel's wheelhouse. Bearings of objects are determined bya sighting arrangement which co-operates with a scale which is set in accordance with thevessel's steering compass bearing, corrected for deviation, whereby the need for acompass on the instrument is avoided. The sighting arrangement can comprise a singlevisible sight, and/or three such sights enabling horizontal angles between objects to bedetermined from a further scale, and/or a radio direction finding aerial.
申请人：KING; RICHARD CREIGHTON
代理机构：Eyre, Mann, Lucas & Just
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