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AIS actual use precautions


S heading and track information is displayed to the consensus, it is possible the ship's AIS is not connected with the electronic compass; and when finding the target ship with AIS information display in the Co or that much difference,[link widoczny dla zalogowanych], AIS display its line of motion vector direction of movement was does not comply, you need to carefully check the course may be user input or a romantic embossed with error; when the ship's radar echoes received his argument was with the AIS shape and the shape and parameters of the generation that much difference, they may be AIS ship the raw data he entered in error, AIS may be false information, false echoes or radar echo. Users were identified according to the circumstances. Constantly sum up experience, strengthen the ability of AIS information to judge. (2) AIS is connected to master and the device characteristics. Some ships currently use the DGPS error location information is not, and some common types of ships using GPS location information is sometimes errors. Voyager Of particular note is that while the U.S. announced the cancellation of the carrier signal in the GPS navigation satellite encryption artificial random noise code (or optional code SA), but we can not rule out the need for war once again artificially reduce GPS accuracy. That particular time and region the error may appear artificial, it is not working. Most of the old crew before the outbreak of the Gulf War were still fresh great that the GPS error is not normal phenomenon. If AIS location information transferred to paper charts, they should pay attention to the selection of GPS positioning system coordinate system coordinate system and paper charts selected the amendment; if AIS is connected with the magnetic compass,[link widoczny dla zalogowanych], magnetic compass heading changes due to the lag and the change of course from the poor, the steering ratio and heading accuracy will be greatly reduced. (3) the limitations of AIS alone. AIS can not replace the radar; AIS are installed only in the two sides of the device to display and liaison. The device is not installed on the ship can not be displayed and communication, especially in small vessels and fishing vessels may not be installed within a period of time AIS equipment. And other stationary targets on water and other environmental conditions can not be displayed without ECDIS. Even with ECDIS not get a panoramic view traffic images waters. 5AIS the negative impact of (1) AIS information is displayed on the monitor may affect the radar. When the AIS information is loaded into the radar screen or ECDIS display, because the radar echo and AIS data sources and processing in different ways, showing the relevant motion parameters will be inconsistent, such as ARPA's vector is calculated by the previous radar data obtained, and compared with real-time motion parameters of AIS, the nature of the difference; In addition, the positioning accuracy of the different location information may not lead to the same, the driver must be based on site conditions, the decision to make the right choice to determine if the display position information of AIS raster form and may even affect the normal radar. (2) the proper use of a variety of navigation equipment is especially important. A variety of communications and navigation equipment is installed bridge,[link widoczny dla zalogowanych], the ship sailed into port when the only safety-related information and is enough to run around the driver struggling; VTS centers and from the ship near the coordination of information, there are ARPA, AIS and ECDIS all kinds of information, what time to choose what equipment is essential to obtain relevant information. Currently able to ship the proper use of AIS is not much, from Xiamen VTS centers found that some long-term ship just let the equipment in working condition, but not to actually use it, VTS center can not be contacted by AIS, in this case, If the over-reliance on the AIS ship to the outside world to communicate and access information or AIS for collision avoidance alone is not desirable. 6 Conclusion The use of AIS for the safe navigation of ships and navigation management provides a new type of very effective means to prevent collision, and various maritime accidents added a wall of protective wall. However, the use of any advanced equipment are inseparable from the human factor,[link widoczny dla zalogowanych], and only a comprehensive understanding of its working principle, characteristics and limitations, and truly master the correct use and use of time can really play its role. * Author: Tu Queensland Rail, the preparatory group of the Xiamen Maritime Bureau VTS, the captain; Address: 393 Nanshan Road, Xiamen City,[link widoczny dla zalogowanych], Nanshan Village, 393-702; Postal Code: 361006; Tel :0592-6895117; E-mailTTK505 @ SOHU. COM
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