Conversation so far:
Who or what is domino?
Antoine Fats Domino Jr. was an American pianist and singer-songwriter.
why did President George W. Bush replace Domino's National Medal of Arts?
For Antoine Fats Domino, among his treasured possessions lost in the 2005 hurricanes was his National Medal of Arts.
What was the result of the 2005 hurricane on Fats Domino?
As Hurricane Katrina approached New Orleans in August 2005, Fats Domino chose to stay at home with his family. Domino was rumored to have died.
Did Fats Domino actually die in Hurricane Katrina?
Later that day, CNN reported that Fats Domino had been rescued by a Coast Guard helicopter.

Question: how did they know where he was?
Self-contained rewrite: how did CNN know where Fats Domino was after Hurricane Katrina?