Kneepuck
 Second Officer
Flight distance : 275105 ft
United States
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There is no good answer to that question. Certainly, the Phantom can fly several miles out. But you say you are in a city with tall buildings. That means, unless you fly very high, you will probably lose the radio signal, and the Phantom, behind a tall building. Don't count on the rth feature to save you. The P3 Pro will not avoid any obstacle in its way during rth. It will just ascend to the programmed rth height and make a beeline for home. If a building is in the way, oh well. So, what it comes down to is, how far are you comfortable with? Stay within your comfort limits. FAA recommends you also stay within direct line of sight at all times. The limits are up to you.
Have fun...
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