https://www.huffingtonpost.com/entry/watch-as-a-drone-saves-two-teen-swimmers-from-heavy-surf_us_5a60be9ee4b062a7df0ba47b
More and more of these kinds of things are popping up.
Two thousand feet offshore (about 610 meters).
Launch it, fly it, and drop the flotation device in about two minutes. Two lives saved.
Exciting.
Stan Nickel