U.S. Coast Guard

RFA Mounts Bay, the British Royal Navy auxiliary vessel from which the helicopter responded.
US Coast Guard website

A  British Royal Navy helicopter has rescued a woman and two children from a capsized boat disabled during Hurricane Maria.  But a man on the vessel has died.

CNBC

The Port of Key West remains closed in the wake of Hurricane Irma, and the Coast Guard is urging boaters to stay away.