I’m wanting to test the new follow terrain beta feature, at very low altitude ~15 feet AGL.
**Question:**I’m curious at low altitude, what sensor is used to determine height AGL? Does it use GPS or Object Avoidance Sensors (e.g. the underside ultrasonic range meter) to determine the height above ground level.
I’ve had issues with using GS Pro to fly low altitude missions (16.4 ft) and over time the drone ends up to be closer to 5 feet due to GPS errors. So it would be preferred if it uses relative sensors like ultrasonic range instead.