Power Lines - On the exterior boundary of the field, 80% of the time there is power lines. We mark the poles but not the wires above. Yesterday we had a 1/4 mile power line on 3 sides of the field, when the drone would get close it would just stop and it would not go around it unless obstacle avoidance was turned off. There was no way the drone would hit these specified power lines, the drone would simply stop mid flight when it saw them. With RTK landing, the drone would also not land near these powerlines. Obstacle avoidance had to be turned off to create a safe landing.