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1. What is a GPS receiver?
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2. How does GPS work?
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3. What is Selective Availability - SA?
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4. How many GPS satellites are there at a given time in the GPS constellation?
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5. Are there concerns with GPS and Radio Frequency Interference?
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6. Why is my GPS unit not locking on to any satellites?
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7. What is the difference on my GPS between 12 channel and 16 channel?
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