Auto Pilot System Series
The Auto Pilot(APS-JJB - ) detects the direction(course) by a magnetic compass. If β the magnetic compass is influenced by the outside, not only does its accuracy get bad but may also cause the ship turn abruptly because the compass card in the magnetic compass is likely to spin. For instance, they could take place if a tool with magnetism is put on the magnetic compass, a person with a tool touche it, or a ship with magnetism passes by.
In navigation mode the Auto Pilot controls the gear from the signals of navigation device connected with APS-JJB-. Therefore, the accuracy of the navigation β device reinforces the location accuracy of magnetic line. The precision of G.P.S known as a mainstream is not absolute, because it’s sent by G.P.S satellite, thus means users can’t control it. Moreover, its accuracy changes spontaneously as scores of meters, in its best condition, and hundreds of meters in its worst condition. However one should keep in mind that sailing a rather differently with the course directed from the navigation device because a ship is always influenced by both winds and waves. Sailing accuracy is dependent on direction angle ratio modulation, declining modulation, receptive modulation, and the directional precision of the magnetic compass, but its accuracy is normally maintained between 4 to 5 meters, or between about 30 to 40 meters in worst conditions.
In short, a course can be off the intended course by more than 50 meters. It can not be completely trusted at all because it is operated by automatic navigation steering. Hence, it is advised to always be alert.
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