Tel: +86-577-65520898
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Ruian Shunfeng Navigation Instruments Co.,Ltd

Add: No.20, Heping Road, Jinhu Street, Ruian, Zhejiang, China
Con: april Zhang
Tel: +86-577-65520898
Fax: +86-577-65966926
Mob: +8618158321811

Landmark Positioning Instrument.

An instrument for making land marks on a coastal vessel. There are four types of measurement, distance measurement, Angle measurement and depth measurement.

1. Bearing instrument: the main bearing circle is the instrument set on the compass or compass repeater to observe the object or azimuth of the celestial body. The main part consists of the camera and the frame. The azimuth circle has 0 ~ 360 scale to be used for the measurement. A telescope in the azimuth circle is handy for precision measurement. Some of the ships were equipped with dummy compasses that were used to observe the standard compass bearings that were blocked by the line of sight. The dummy compass is simple, and does not refer to the north part.

2. Distance measuring instruments: optical instruments for measuring distance of Marine measuring objects, have two types: base-type and elevation type. The former is based on the distance of the base length of the range finder; The latter is based on the height of the object. Using or using a telescope with a density scale can also measure the elevation Angle according to the height of the object. Radar (see) is an instrument that can measure both azimuth and distance. It can be observed in poor visibility and at night, which is an instrument with high positioning accuracy. The accuracy of radar distance measurement is higher than that of azimuth.

3. Angle measuring instruments: mainly sextant. Sextant two horizontal Angle measured three item target, reoccupy is composed of a circular dial and three ruler of three pole locator (also known as the three bar dividing meter), according to the horizontal Angle value position on the chart. There is a three-pole positioner with a set of reflectors, which can be used instead of a six-point instrument to directly observe the horizontal Angle and position it on the chart.

4. Sounding instrument: usually the ship has hand lead and echo sounder. The water in the proper contour of the contour can be used to detect the position. The technology that is developing to use the ocean floor topography is to make the depth data measured continuously through the electronic computer, and then compare with the known ocean floor geomorphology.