| 摘要 |
A maritime safety system comprising at least one transmitter unit ( 12, 14, 16, 18 ), each transmitter unit being arranged to transmit successive signals by wireless communication at pseudo random intervals and each transmitter unit ( 12, 14, 16, 18 ) having an associated transmitter range, a base station ( 10 ) arranged to receive said transmitted signals and an alarm device ( 20 ). The base station ( 10 ) is arranged to cause the alarm device ( 20 ) to generate an audible and/or visible alarm when a plurality of successive signals from at least one of the transmitter units ( 12, 14, 16, 18 ) are not detected, and the arrangement is such that when a transmitter unit ( 12, 14, 16, 18 ) is disposed a distance from the base station ( 10 ) which is greater than the transmission range associated with the transmitter unit and a plurality of successive signals are not detected, an audible and/or visible alarm is generated.
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