SEATTLE -- When Capt. Billy Fittro invited Peggy Warrack to go sightseeing on a 2,500-ton ferry, there appeared to be nothing to stop him that day in October 1983. Then he hit an unnamed rock off Orcas Island, among the San Juan Islands 65 miles north of Seattle. Submerged in the path of the ferry Elwha, the rock caused $250,000 worth of damage, ended Fittro's career with the state and led to the dismissal of the ferry system chief. It also caused howls of laughter. Spurred by a Seattle book dealer who wanted to name the bump that made maritime history, the Washington State Board on Geographic Names decided Friday to designate Elwha Rock on state maps. The rock gained fame after it abruptly ended a full-speed detour that Fittro took from his normal route between Lopez and Orcas islands to give Warrack, an unauthorized guest in the pilothouse, a look at her beachfront house. With damage to its hull, keel and rudder, the huge Elwha began "doing doughnuts" at 17 1/2 knots, witnesses said. None of the 70 people aboard was injured. Fittro resigned. The ferry system chief, Capt. Nick Tracy, was fired for concocting a story to shield Fittro. Warrack held a news conference to deny rumors she was a "siren of the San Juans." The Island City Jazz Band played a new song, "Elwha on the Rocks," and a local tavern offered a drink of the same name. Book dealer Greg Lange, a San Juan Islands history buff, said he pushed the proposal to remind people of dangers in sea travel. The rock near Grindstone Harbor is submerged about two-thirds of the day. Rocks on charts are frequently named after ships that hit them, Lange noted. Besides, he said, no rocks were named for ferries. Heidi Keller, a ferry system spokeswoman, said management had no objection to the designation. Bonnie Bunning, executive secretary of the geographic board, said no one has opposed the designation. Fittro could not be reached. Warrack said she would rather forget the whole thing. Warrack, who describes herself as a wealthy widow, said she has no idea why Fittro, whom she had just met that day, invited her to the pilothouse. "The mate mentioned that I lived in Grindstone Harbor. And he {Fittro} said, 'Let's take a look.' I was never so frightened in my life. I knew there were reefs there. He didn't even slow down." Bunning said state maps will be changed to indicate the name, but that it may take 10 years. A proposal to change federal maps will be forwarded to the U.S. Board on Geographic Names, which generally accepts state recommendations. Current charts show no named rocks near the site, but state: "Mariners are cautioned that the Washington State Ferries may deviate from the published standard routes."