In what situation will an AIS unit enter "standby" mode?

In what situation will an AIS unit enter "standby" mode?

• A. When the vessel is anchored
• B. When the vessel is operating at low speed
• C. When the vessel's power supply is low
• D. When the vessel is out of range

Answer: (A)

The AIS (Automatic Identification System) unit enters "standby" mode primarily when the vessel is anchored. In this state, the AIS unit reduces its reporting rate to conserve power and minimize unnecessary transmission of data. This is because an anchored vessel typically does not change its position and movement is minimal. Consequently, it is not required to transmit the same level of AIS data used when the vessel is underway, where continuous positional updates are essential for collision avoidance and situational awareness. In contrast, while operating at low speed, the vessel is still in motion and is thus required to maintain normal AIS transmission. A low power supply situation may cause the unit to turn off completely or enter a different power-saving mode, but it would not specifically trigger the standby mode. Being out of range does not cause the AIS to enter standby mode; rather, it can result in a loss of signal, and the system does not switch into standby since it is still powered and operational, just unable to communicate.

The AIS (Automatic Identification System) unit enters "standby" mode primarily when the vessel is anchored. In this state, the AIS unit reduces its reporting rate to conserve power and minimize unnecessary transmission of data. This is because an anchored vessel typically does not change its position and movement is minimal. Consequently, it is not required to transmit the same level of AIS data used when the vessel is underway, where continuous positional updates are essential for collision avoidance and situational awareness.

In contrast, while operating at low speed, the vessel is still in motion and is thus required to maintain normal AIS transmission. A low power supply situation may cause the unit to turn off completely or enter a different power-saving mode, but it would not specifically trigger the standby mode. Being out of range does not cause the AIS to enter standby mode; rather, it can result in a loss of signal, and the system does not switch into standby since it is still powered and operational, just unable to communicate.