Kelly Rowland can thank the Coast Guard for being a survivor after the service helped locate a boat carrying the Destiny’s Child singer Friday when it became lost at sea off Cape Cod. The captain of the vessel carrying Rowland and some friends got disoriented while following a whale-watching vessel about 30 nautical miles from Provincetown, Mass., said a Coast Guard spokeswoman from District 1, which overseas the Northeast region. Watchstanders at Sector Boston received a call around 4 p.m. Friday reporting the situation. “Using our Rescue 21 system, we were able to triangulate their position,” said Public Affairs Specialist…