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DJI Spark Compass Calibration
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<blockquote data-quote="BudWalker" data-source="post: 36936" data-attributes="member: 787"><p>You're right but it's more than that. In the past year or so there have been several threads in this and the other forums where it's been claimed that a flawed calibration can cause a fly away. Members have been asked (or challenged) to come up with just one incident where there was at least some evidence to support the claim that a flawed calibration caused a fly away. So far not one incident has been presented. And I think they tried <u>really</u> hard hoping to prove me wrong. </p><p></p><p>[USER=18]@msinger[/USER] is right. A calibration will be rejected if the geomagnetic field is distorted within the confines of the compass dance. In this case the "interference detected, move location" message will be issued. A calibration can only detect and compensate for distortions that rotate with the AC. External distortions may be detectable but the data is ambiguous and, therefore, can not be compensated for. In fact, this ambiguity is the criteria by which the calibration is rejected.</p><p></p><p>Part of the reason, IMHO, that the flawed-calibration-causes-fly-away misconception exists is that it's easy to confuse it with the launch-from-geomagnetically-distorted-site-cause-fly-away. The latter has happened many times. And, usually without any error or warning being issued. No amount of calibration, in any location, or not calibrating, will have an effect on this type of fly away. The single most effective way to prevent these fly aways is to check before launch that the red triangle heading indicator on the map display is consistent with the AC's actual orientation.</p></blockquote><p></p>
[QUOTE="BudWalker, post: 36936, member: 787"] You're right but it's more than that. In the past year or so there have been several threads in this and the other forums where it's been claimed that a flawed calibration can cause a fly away. Members have been asked (or challenged) to come up with just one incident where there was at least some evidence to support the claim that a flawed calibration caused a fly away. So far not one incident has been presented. And I think they tried [U]really[/U] hard hoping to prove me wrong. [USER=18]@msinger[/USER] is right. A calibration will be rejected if the geomagnetic field is distorted within the confines of the compass dance. In this case the "interference detected, move location" message will be issued. A calibration can only detect and compensate for distortions that rotate with the AC. External distortions may be detectable but the data is ambiguous and, therefore, can not be compensated for. In fact, this ambiguity is the criteria by which the calibration is rejected. Part of the reason, IMHO, that the flawed-calibration-causes-fly-away misconception exists is that it's easy to confuse it with the launch-from-geomagnetically-distorted-site-cause-fly-away. The latter has happened many times. And, usually without any error or warning being issued. No amount of calibration, in any location, or not calibrating, will have an effect on this type of fly away. The single most effective way to prevent these fly aways is to check before launch that the red triangle heading indicator on the map display is consistent with the AC's actual orientation. [/QUOTE]
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DJI Spark Compass Calibration