Motorized life buoy - GIF

Motorized life buoy.

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Previously:

Drone delivers rescue buoy to drowning man - GIF
Remote-controlled rescue buoy - GIF
WWII German rescue buoy - photos

So now the mnemonic is:

Reach; Throw; ROBOT; Row; Go ?

Wouldn't that be a life preserver as opposed to a buoy? Aren't buoys stationary by design?