Which statement about AIS is TRUE?

Which statement about AIS is TRUE?

• A. AIS is a short-range VHF-FM system
• B. AIS is only used for tracking purposes
• C. AIS requires manual input for data accuracy
• D. AIS transmits data at long distances only

Answer: (A)

The statement that AIS is a short-range VHF-FM system is true because AIS (Automatic Identification System) operates primarily using Very High Frequency (VHF) radio waves. Specifically, AIS transmits and receives messages over VHF frequencies, typically in the range of 156.025 MHz and 156.075 MHz, which are utilized for communicating navigational and safety information. This system is designed for short-range communication, generally effective up to about 20-30 nautical miles, depending on the vessel's antenna height and environmental conditions. Other statements do not accurately reflect the nature of AIS. Although AIS can be used for tracking purposes, its functionality extends beyond that; it also aids in safety and navigation by providing vessel traffic information, collision avoidance, and navigation support. While manual input can enhance the accuracy of some data, many essential elements are automatically generated by the vessel's onboard systems. Lastly, AIS does not exclusively transmit data over long distances; it is designed for effective short-range communication to improve maritime safety and awareness among vessels operating in proximity to one another.

The statement that AIS is a short-range VHF-FM system is true because AIS (Automatic Identification System) operates primarily using Very High Frequency (VHF) radio waves. Specifically, AIS transmits and receives messages over VHF frequencies, typically in the range of 156.025 MHz and 156.075 MHz, which are utilized for communicating navigational and safety information. This system is designed for short-range communication, generally effective up to about 20-30 nautical miles, depending on the vessel's antenna height and environmental conditions.

Other statements do not accurately reflect the nature of AIS. Although AIS can be used for tracking purposes, its functionality extends beyond that; it also aids in safety and navigation by providing vessel traffic information, collision avoidance, and navigation support. While manual input can enhance the accuracy of some data, many essential elements are automatically generated by the vessel's onboard systems. Lastly, AIS does not exclusively transmit data over long distances; it is designed for effective short-range communication to improve maritime safety and awareness among vessels operating in proximity to one another.