Concerning of Poor GPS Signal
It is possible unable to receive GPS/GLONASS signal or signal low in these places:
Inside the tunnel, GPS/GLONASS signal is
blocked.
Beside some buildings,
GPS/GLONASS signal is low or
disturbed.
Covers above,GPS/GLONASS signal are
blocked.
Inside forests, or too many covers,
GPS/GLONASS signal is low or
disturbed.
Inside buildings, GPS/GLONASS signal is
blocked.
If you use the GPS/GLONASS Receiver inside the car, some anti-sunlight windscreen film will make the GPS/GLONASS signal degraded or
signal blank.
GPS/GLONASS satellite is owned by America military; sometimes they will tune-down the accuracy by some reason. In such cases, the
GPS/GLONASS position may not fixed exactly.