Flight height question

[RichardThiery]

If I start flying at top of mountain and then fly down does it go to negative height?
I'm assuming the height starts with 0 from starting altitude, not sea level.

Is there any issue flying at negative height?

 

[Cafguy]

The only issue you may have in that situation is Return to Home.

 

[Meta4]

If I start flying at top of mountain and then fly down does it go to negative height?
I'm assuming the height starts with 0 from starting altitude, not sea level.

Your drone does not know what sea level is.
It only knows that home = 0 feet

Is there any issue flying at negative height?

No ... it makes no difference whether the height is + or -.

The only issue you may have in that situation is Return to Home.

How so?
It shouldn't make any difference at all.

 

[SkyeHigh]

The only issue you may have in that situation is Return to Home.

Are you sure?

If you have an RTH height set to 50-metres for example, that is 50-metres above takeoff point. If you were then flying 50-metres below takeoff point and hit RTH the drone will climb 100-metres before starting its return home.

 

[PINEBARON]

Refer to the thread below for insight into RTH quirks close to starting point:
RTH