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1
Content available Magnetic Compass in Modern Maritime Navigation
Lushnikov E.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2015
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Vol. 9, no. 4
539--543
EN
This article looks into the role of magnetic compass in providing the navigational safety of the ship. Existing requirements for the magnetic compass at the presence of satellite navigation are not economically justified. Therefore, a new rational requirement is proposed for the accuracy and frequency of deviation compensation work assuring the safety of navigation and cost-effectiveness. The proposed method has been verified by a lab experiment.
2
Content available remote The Problem of Magnetic Compass Deviation at Contemporary Conditions
Lushnikov E. M.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2010
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Vol. 4, no. 1
65--66
EN
The problem of accuracy magnetic compass for contemporary condition is described. The technique of actualization of deviation’s table at conditions of voyage is offered. The methods and means of actualisation is described also.
3
Content available remote The Basic Research for the New Compass System Using Latest MEMS
Fukuda G., Hayashi S.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2010
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Vol. 4, no. 3
317--322
EN
This paper demonstrates basic research for a new compass system using latest MEMS (Micro Electro Mechanical Systems) sensors for small vessels. In 2007, MEMS Electrostatically Gyro (ESG) was introduced by TOKYO KEIKI which is a Japanese company. This sensor accuracy has dramatically improved compared to vibration types. For example, instability has been improved 10 times more than the vibration types. The reproducibility was tested and maximum difference was 0.55 [deg/sec] in the field test. The MEMS-ESG could detect the relative angles as accurate as GPS compass in short term use. Even though sen-sor accuracy has been improved, an improvement of another 10 times is needed to detect the earth’s turn rate. Because of this a second system is required for a complete compass system. A celestial navigation system is one of the possibilities to complement this. Traditionally the sextant has been used for measuring the altitude, but it has some human errors and difficult to measure continuously. Therefore, it might be useful to get sun altitude and direction automatically. In this thesis, the sun altitude and direction detecting system using camera devices are studied. Using 350×288 resolution camera and a radio-controlled clock, the sun movement was detected 5’14” per pixels and 2’16”. per pixels for the altitude and direction respectively. Although this is a basic research for an integrated system, the data should have an enormous affect upon future research.
4
Content available remote 3d Sonar for Navigation and Obstacle Avoidance
Bowles I., Markowski Z.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2010
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Vol. 4, no. 1
61--64
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