If i launch my drone from a 500 ft mountain and i set my RTH to 100 ft, will the bird return by flying down to 100 ft and hit the mountain on the way back or will it fly up to 600 ft and back ?  Does the gps knows the vertical distance relative to the take off point in my case ?

It will raise to 600 ft and fly home. Your height is from take off if you fly over a ravine your height will be a minus, your Rth height will always be measured by take off point.

The 100 feet is from your take off point - which is recorded as 0.
If you fly out and down below your take off point, your recorded altitude will be minus values.

Only one way to find out!

ALABAMA Posted at 2017-9-20 10:14
Only one way to find out!

I'd rather ask than losing $1600 !!

coco60 Posted at 2017-9-20 10:45
I'd rather ask than losing $1600 !!

You are wise

coco60 Posted at 2017-9-20 10:45
I'd rather ask than losing $1600 !!

Optionally you can read the manual ...

coco60 Posted at 2017-9-20 10:45
I'd rather ask than losing $1600 !!

Keep that thought. And BTW, the GPS does not measure altitude in a DJI aircraft, it is far too innacurate. Altitude is measured by a barometer in the aircraft.

Dobmatt Posted at 2017-9-20 15:29
Optionally you can read the manual ...

Hey Bro, that's my line...

But I prefer to word it thus wise: RTFM!! ;-)



It was good talking to you last night. Looking forward to a delightful lunch and enlightening conversation, this Sunday.
Bring your Hunger Games!! Ha


RedHotPoker

Genghis9 Posted at 2017-9-20 11:09
You are wise

Yes, but there are a few here, that are wise, beyond their years. ;-)



RedHotPoker

@coco60,
I was half expecting a trigonometry or calculus equation.

Oh well, I'll now put both of my slide rules away...


From quora.com

Many Mathematical problems have caused brain damages to great mathematicians and it's almost impossible to choose one over all of them.

BUT, If I have to pick ONE problem, it would be the Riemann hypothesis !

"If I were to awaken after having slept for a thousand years, my first question would be: Has the Riemann hypothesis been proven?"

Yes... Go figure.

RedHotPoker

hallmark007 Posted at 2017-9-20 10:08
It will raise to 600 ft and fly home. Your height is from take off if you fly over a ravine your height will be a minus, your Rth height will always be measured by take off point.

^What hallmark said.

Agree with 2#. The take-off point will be recorded as 0.