How does ardupilot measure its altitude?

Hi all,

I'm wondering is the altitude data comes from GPS?

and if I want to set some waypoints using MAVLink protocol, how could I decide the altitude is proper or not?

Thanks.

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Waypoint File Format

Hi all, just study the MAVProxy and found there is a feature of waypoint

I can load a list of waypoints using command:

wp load filename.txt

But I'm wondering what is the format of the file?

I searched the MavLink wiki and found this page

it says:

Format

QGC

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