Does the testing area provide a clear view of the sky?
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If you have a tree lined course of high building nearby you may need to use a higher degree elevation mask. For example, changing the default 5° to 15° will remove low level satellites from the solution, that may be influenced by multi-path reflections. |
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Has the GPS antenna been mounted on a suitable ground-plane, with a clear view of the sky and away from any obstructions? |
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Check the condition of your antenna cables. |
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| Dirt or dust in the antenna connectors | Crimps in the cable |
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| Breaks in the cable | Cuts or nicks in the cable insulation |
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If possible, try experimenting with a different antenna. |
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