Negative height showing?

[Bunraku]

Hi

Just took my MP out for a quick flight and calibrated my compass before take off.
One thing i noticed is that my height about 1m above ground was showing as -1.5m .
Any idea what caused this?

Thanks

 

[old man mavic]

the shown value is not an absolute it will vary a certain amount plus you will get a negative value if you fly from a high point and descend below the point you took off from

 

[Bunraku]

the shown value is not an absolute it will vary a certain amount plus you will get a negative value if you fly from a high point and descend below the point you took off from

That would make sense, but I was flying on a football field?

 

[old man mavic]

as i said before the mav uses different sensors to get the height above the take off point and this can vary as much as 10 ft due to many factors and is not really that accurate it does not have a calibrated altimeter on board like an aircraft it is nothing to worry about