The app will regularly check if you're moving by bike by reading accelerometer data. As soon as the app thinks you're riding a bike it will turn on GPS to log the ride accurately. To conserve battery life, however, the app doesn't check every second, so there is usually a slight delay before the app knows you've started riding and before it turns on GPS to log your exact route. The low-accuracy location points will be marked with a dashed line.
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