设置紧急呼叫：发送BD到定位器，绑定号码为紧急呼叫号码。连按两次开机键，定位器会呼叫紧急呼叫号码。

Set SOS call number: send BD to locator, the sender is set as emergency number, when push SOS button twice, locator will call that number.

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如果当前定位器处于关机状态，那么直到定位器自动开机后，用户才会收到从定位器返回的位置信息的短信。

If the current locator powered off, after locator boot automatically again, the user will receive from the locator returns location information by SMS.

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此外，NEO-M8U在开机后就能立即提供定位信息，无需像一般的GNSS接收器一样需要等待首次定位时间。

In addition, NEO M8U offers instantaneous position immediately after power up, without the need to wait for a first fix as with regular GNSS receivers.

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