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What is the use of a G-sensor in a dashcam?

What is the use of a G-sensor in a dashcam?

Every dashcam has a built-in G-sensor. A G-sensor is a sensor in the dashcam that registers vibrations. In case you have an accident, the G-sensor will notice and the dashcam will save the current recording as 'emergency file' that cannot be erased. The sensitivity of the G-sensor can usually be adjusted in the dashcam's menu. 

The way the dashcam saves the Emergency files differs from type to type. Some dashcams store the emergency files in a separate Emergency folder, others protect the video so it cannot be erased by the loop recording on the dashcam.

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