Its propagation is better than that of radar, due to the longer wavelength.
It’s possible to “see” around bends and behind islands if the land masses are not too high.
Additional safety at night time.
Limitations of AIS
The system coverage range is similar to other VHF digital applications which depends upon the height of the antenna. Typical Range 20 NM.
With the help of repeater stations, the range can be increased.
Some vessels like fishing vessels leisure craft and vessels below 500 GRT may not be fitted with AIS.
Accuracy of the info received is only as accurate as what is entered in the static/voyage or safety messages data.
The OOW should always be aware that AIS fitted on other ships under certain circumstances, can be switched off on the master’s professional judgment.
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