DJI has no knowledge of AGL. Everything DJI calculates is relative to the launch point as elevation zero, instead of sea level. No FW update will ever change this. Even the 400 foot flight ceiling is wrongly calculated as above your launch point rather than true AGL. Similarly, the 500m max, when within 50km of any airport, is always above your launch point, preventing legal mountain climbing from the base, even while continuously remaining within 400 feet of the ground.