With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?

通过将正确的设备调整到正确的频率，如何防止小偷干扰你的设备阻止警报信号到达基站呢？

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Any distress vessel in the all sea areas may use DSC device working on different frequency to send distress alert.

在各海区的遇险船舶均可使用不同频率的DSC设备进行遇险报警。

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More parts are coming with radio frequency ID (RFID) tags to automatically alert airlines and manufacturers of a problem.

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If there is still no response, a distress alert will be transmitted on the emergency frequency to the nearest coastguard and nearby shipping.

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