S800 WKM IMU set help!

[Zzr]

I can't figure it out for z-axis value. Is measure from the ground to the IMU sits?
x is -7
Y is 0
Z is ?

S-800 with Wkm. I flown a few times without setting with IMU XYZ Zero. It fly fine.
Thanks for any help.
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[Zzr]

Funny one!
He didn't adjust any setting IMU
http://www.youtube.com/watch?v=oKj87qGsnOM