I recently bought my first GPS unit- Garmin Etrex Legend Hcx. I've been fooling with it and have noticed something I can't find an explanation for. I understand that the satellite page shows the satellites that are above the horizon, which is represented by a circle. There's an icon on the horizon circle that I can't figure out. It's a grey sphere with a red dot in the center which moves, apparently randomly, along the horizon circle. Does anyone know what this is.
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