Hi all

just to be sure, when you setup a list of way point with 20M altidue, it is AGL altitude ? if you are in montains your device will climb as the waypoints are climbing ?

From my tests it's altitude AGL relative to the takeoff point. On iPad GS doesn't know about the elevation of the terrain.

I agree with DarylWM.  Whatever controller you're using, it has no idea of what topographic changes are anywhere nearby.

It also doesn't know houses, trees, dogs, whatever.

With an A2 and IOSD Mr ii setup, you can download the flight parameters and look at the altitude.

Everything is relative to the home point, without regard to hills or valleys.

There are also several pages in the Pc Ground Station manual warning about things like taking off from rooftops or in valleys

But why is it then, that if a waypoint is set above water, the default map altitude will be at the bottom of the lake, river, ...
That's what it says in the GS manual.

If waypoint height would be relative to the Home Point, it would make no difference if there is soil or water underneath, wouldn't it.

Hi.

Did a short test flight this afternoon. above sloping terrain. The route was programmed so that on the outbound track, the track was heading into the valley, a turn "in" the valley and back home again.



So if the aircraft would have followed the terrain, there had to be a descent on the way out and an ascent on the way back. But, there wasn't. The aircraft kept the same height during the flight, which was the programmed height of the first waypoint.



So the height of each waypoint is always based on the height of the home point, not of height ASL of the waypoints.
My first thought was, this does not make much sense. As long as you have your notebook with you and your aircraft is connected via Data Link, the system knows where the aircraft is and could adapt the altitude based on the Google Map. But what if you lose the connection. Then there is no way for the aircraft to know how high or low above ground it is at the moment. So, actually the reference to the home point does make sense. In conclusion, if one wants to fly at a fixed altitude above ground, one has to adjust the waypoint heights.

This really should be mentioned in the manual!!!

And if the waypoint height is relative to the home point - which it is - it doesn't make any difference if there is water or rocks underneath the aircraft. Thus, the warning, that above water the default map altitude will be at the bottom does not make much sense.