Provided you have a suitable and serviceable GPS antenna connected to the A100, lack of GPS signal can be caused by factors such as installation location or even environmental factors.
The best rule of thumb to remember is that the GPS antenna should be mounted as high as possible (do not mount on the top of a high mast though as the motion of the vessel will cause the antenna to swing and potentially reduce the accuracy of the GPS position), with a clear view of the sky above and out of the direct path of RADAR or satellite communication antennas.
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