Calibration IMU MPU-9250 on openplotter 0.9.0

[gniersma]

Hi 

Bought a combined I2C sensor with MPU-9250 and BMP180.

The sensor is recognized on the I2C page as MPU-9250, SK diagnostics show some information.

There is button "calibrate"  in 0.9.0 on the I2C tab. is there some information about how to calibrate this sensor ? 
After pushing this button no information pops up... is this correct ?

I saw in another post, 

Code:

cd /home/pi/.config/openplotter/imu
RTIMULibDemoGL

this brings up the calibrator as explained on this page
--> I assume you can do it in the lab by moving around the sensor.

But should i recalibrate once installed on the boat ?
--> This would be difficult with 200 smaples in each octant

anybody experience with this ?

Thanks in advance !