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Spark problem with first Litchi takeoff
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<blockquote data-quote="Andre Levite" data-source="post: 90279" data-attributes="member: 10850"><p>As others have pointed out 10 satellites is the bare minimum to avoid loss of GPS mode and switch at ATTI. The number of satellites will usually increase as you elevate away from ground clutter but that is not always the case. </p><p></p><p>Here is a random UAV screen shot I took right now at my home:</p><p>[ATTACH=full]9986[/ATTACH]</p><p></p><p>You can see that a set location will have great variation throughout the day with anywhere from 10-17 satellites visible. Even when there are enough satellites the KP index can cause interference. On top of that there are random fluctuations in the ionosphere that wreak havock with weaker GPS antennas like the Spark's. </p><p></p><p>I get the audible alert "GPS ok to fly" at 10-11 GPS but wait until 13-14 present. At altitude I'll see 17+. Maybe I'm just lucky where I live but using UAV Forecast and waiting for 13+ GPS has kept ATTI mode at bay.</p></blockquote><p></p>
[QUOTE="Andre Levite, post: 90279, member: 10850"] As others have pointed out 10 satellites is the bare minimum to avoid loss of GPS mode and switch at ATTI. The number of satellites will usually increase as you elevate away from ground clutter but that is not always the case. Here is a random UAV screen shot I took right now at my home: [ATTACH type="full" alt="9986"]9986[/ATTACH] You can see that a set location will have great variation throughout the day with anywhere from 10-17 satellites visible. Even when there are enough satellites the KP index can cause interference. On top of that there are random fluctuations in the ionosphere that wreak havock with weaker GPS antennas like the Spark's. I get the audible alert "GPS ok to fly" at 10-11 GPS but wait until 13-14 present. At altitude I'll see 17+. Maybe I'm just lucky where I live but using UAV Forecast and waiting for 13+ GPS has kept ATTI mode at bay. [/QUOTE]
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Spark problem with first Litchi takeoff