SF11 Lidar use to -1

Ah sorry, as you referred to EKF I forgot about that part. There are different settings, the EKF one just prevents the EKF to use it as a height reference, but it doesn’t disable Copter to use it for surface tracking or landing - to do that you need to use an aux switch (in low position) set to the rangefinder option: http://ardupilot.org/copter/docs/channel-7-and-8-options.html (it’s called sonar in this page).

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