A number of factors including an unusually large rogue wave may have led to the fatal boating accident just south of San Francisco's Golden Gate Bridge that killed a couple, both in their 50s, who friends say were experienced sailors.

The husband/skipper had sailed their Ranger 33 for more than 25 years.

"He was a very good sailor and a very careful sailor," said one friend. "[He] always conducted person-overboard drills, and was always very, very careful."

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