An inadequate lookout probably played a key role in causing a yacht to crash into an island during a 125-mile California-to-Mexico yacht race, killing all four people aboard, a report concluded.

The 37-foot Aegean likely was on autopilot when it sailed past a GPS waypoint and smashed into the tip of North Coronado Island off the Mexican coast in the pre-dawn darkness of April 28, according to a report released Tuesday by US Sailing, yacht racing’s national governing organization.

Click here for the full report by The New York Times.

Click here for the official announcement, with link to the report, by US Sailing.