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I'm glad to see you here @Vezz148, how's everything going? At least two dozen GPS satellites are constantly in orbit around the Earth and broadcasting data. All GPS devices, whether your phone or a Fitbit Surge, require a direct path to these satellites in order to receive their radio transmissions. If the signal is being blocked—either because you're underground, near many tall buildings, or as a result of atmospheric effects—GPS will not work. Thus, whereas GPS gives you a more accurate measure of distance than step counting alone, the actual accuracy depends on both your environment and the weather.
If you're running with your Surge and the GPS signal is lost, rest assured Surge will continually search for a GPS signal as long as the exercise is in progress.
If you feel that your distance measurement isn't being accurately tracked, you may want to adjust your stride length. Follow the steps below to calculate your stride length and then add that information to your Fitbit account.
- Go to a track or some place where you're sure of the distance.
- Count your steps as you walk across that distance, making sure you travel at least 20 steps.
- Divide the total distance (in feet) taken by the number of steps to get your stride length.
Your running stride can be calculated the same way, only by running a known distance rather than walking.
Hope this information helps my friend, keep me posted! 
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