Navigation aid
US4976039A · kind A · utility
Inventors
Key dates
| Filing date | Aug 30, 1988 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Aug 30, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/203
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is described a navigation aid for use in sailing vessels. The navigation aid comprising a casing having at least one side wall, the side wall having an aperture, and at least one end wall, the end wall also having an aperture. The casing encloses at least one reflective surface such as a mirror movably mounted on a linked frame in the form of an elongate member formed with two end sections, and a central section, the central section being formed to receive the reflective surface. Light entering the aid via the aperture in the side wall will be reflected off of the reflected surface through the aperture in the end wall. Thus an object positioned at the side of the casing can be viewed through the aperture in the end wall. The aperture in the side wall comprises a static marker which may be aligned with objects viewed through the aid for a range of pre-set angles, between the reflective surface and the central axis of the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.