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Yesterday, I almost lost my Spark
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<blockquote data-quote="Rick W" data-source="post: 80929" data-attributes="member: 14044"><p>As I read your story, two possible ideas crossed my mind. I personally favor the second explanation although both may have contributed: 1.)How far away were you from the last location where you calibrated the compass on your Spark? If it was far, calibration at the new location might have helped. If the difference between true North and compass North is significant, the spark's compass location can go into conflict with the GPS or IMU location. 2). The compass errors can also occur due to metal in the ground. The compass helped determined your RTH location before takeoff. As you climbed to an altitude of 394 feet, the affect of the ground metal on the compass declined and again, the GPS, IMU and compass locations became different and an error was reported. I favor the second because I think you would have had a compass error at takeoff with the first. The Yaw error occurs often with compass errors and seem to be linked. Because you had 17 satellites for the GPS, your spark was still able to find its way home even without an accurate compass location. A great lesson for all of us to remember is how valuable that 17 GPS was.</p><p></p><p>BTW You English is great!!</p></blockquote><p></p>
[QUOTE="Rick W, post: 80929, member: 14044"] As I read your story, two possible ideas crossed my mind. I personally favor the second explanation although both may have contributed: 1.)How far away were you from the last location where you calibrated the compass on your Spark? If it was far, calibration at the new location might have helped. If the difference between true North and compass North is significant, the spark's compass location can go into conflict with the GPS or IMU location. 2). The compass errors can also occur due to metal in the ground. The compass helped determined your RTH location before takeoff. As you climbed to an altitude of 394 feet, the affect of the ground metal on the compass declined and again, the GPS, IMU and compass locations became different and an error was reported. I favor the second because I think you would have had a compass error at takeoff with the first. The Yaw error occurs often with compass errors and seem to be linked. Because you had 17 satellites for the GPS, your spark was still able to find its way home even without an accurate compass location. A great lesson for all of us to remember is how valuable that 17 GPS was. BTW You English is great!! [/QUOTE]
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Yesterday, I almost lost my Spark