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New to Spark - confused about loss of signal and auto land
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<blockquote data-quote="PhantomFandom" data-source="post: 76200" data-attributes="member: 15128"><p>The single engine planes I flew did not have GPS in the cockpit so I can't comment definitively on your comment about 3 satellites to get a lock. I do know that you need at least 4 mathematically to pinpoint your position in 3-D space. 3 satellites would only give you a position in 2-D space. Depending on where you are, you "could" make an educated guess with only 3 satellites in 3-D space because one of the two points could end up being way out in space or inside the earth.</p><p></p><p> Either way I can't conceivably see how a GPS that is approved for navigation in the cockpit, can be used with only 3 satellites. What happens when you have transmission errors? What happens when one satellite moves out of view? I think you need just as many (and likely more) satellites when using a GPS for navigation in the cockpit, as you do when flying a drone.</p><p></p><p> Each person obviously has their own comfort level and preferences. I have my threshold set at 10. If it's less than 10, I would make a determination on the fly. I would consider 7 a bare minimum. I would fly with fewer (or none) if I knew I was doing strictly ATTI mode flying in close visual range and low wind.</p></blockquote><p></p>
[QUOTE="PhantomFandom, post: 76200, member: 15128"] The single engine planes I flew did not have GPS in the cockpit so I can't comment definitively on your comment about 3 satellites to get a lock. I do know that you need at least 4 mathematically to pinpoint your position in 3-D space. 3 satellites would only give you a position in 2-D space. Depending on where you are, you "could" make an educated guess with only 3 satellites in 3-D space because one of the two points could end up being way out in space or inside the earth. Either way I can't conceivably see how a GPS that is approved for navigation in the cockpit, can be used with only 3 satellites. What happens when you have transmission errors? What happens when one satellite moves out of view? I think you need just as many (and likely more) satellites when using a GPS for navigation in the cockpit, as you do when flying a drone. Each person obviously has their own comfort level and preferences. I have my threshold set at 10. If it's less than 10, I would make a determination on the fly. I would consider 7 a bare minimum. I would fly with fewer (or none) if I knew I was doing strictly ATTI mode flying in close visual range and low wind. [/QUOTE]
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New to Spark - confused about loss of signal and auto land