A spectator boat (vessel 1) for a regatta was stationary, using dynamic positioning system. 

Upon looking forward, operator of spectator boat saw vessel 2 bearing down on it and noticed nobody at the helm. 

Spectator boat immediately hailed vessel 2 on VHF 16, with no response. 

The operator of vessel 1 blew the horn, which caused the skipper of vessel 2 to dash to the helm and attempt to turn the boat but was too late. Vessel 2 struck vessel 1 midships.
LONG ISLAND SOUND
Mamaroneck                    