No signal or weak signal normally occurs when the receiver does not have a clear signal view of the sky.
Your receiver requires a direct line of sight between the receiver and the satellites. When an object lies within the direct path, accuracy suffers due to reflections and weakening of signals. This can be the cause of lost signal in urban environments, within valleys, and on mountain slopes. In all three situations, the objects (buildings and the Earth itself) are substantial enough to completely block the GPS signals. When weak signals are received, they may have been reflected off buildings and the surrounding landscape. Reflections generate multi-path signals arriving with a small time delay at the receiver. This results in inaccurately calculated position.
Make sure you have a clear view of the sky and refer to accessory instructions.
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