Records show the exact route of the Volare, a 49-foot private cabin cruiser, carrying many members of the same family.
The first inaccuracy still being repeated Wednesday is that the Volare left the Saint Francis Yacht Club, where the flag now flies at half-staff. Actually, the boat docked across from the Golden Gate Yacht Club near the public fueling station to pick up its passengers.
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Longtime sailor Mike Peterson has been gathering information from the boating community since the tragedy.
"And it was parked over on an end-tie here, the passengers embarked and the plan was for them to disembark right here," he said.
We now know from emergency officials that 20 people and a dog went out on a memorial cruise aboard the Volare, registered out of Stockton and owned by political consultant John Boisa.
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"This is a boat that's been tested, proven on the water, ocean-going," Peterson said. "And it's the sort of boat you would expect that, because of its quality and being so seaworthy, this sort of thing shouldn't have happened."
Online boat trackers show the Volare left West Harbor around 10 a.m. Tuesday, passed beneath the Golden Gate Bridge and circled into the ocean, came back through and docked at Angel Island's Ayala Cove around noon. The tracker shows the boat stayed there for three hours and then headed back toward the docks before catastrophe hit just past Alcatraz Island.
Coast Guard Dispatch radioed, "The Coast Guard has received a report of a capsized vessel approximately one-fourth mile west of Alcatraz Island."
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We still don't know for sure what happened.
One San Francisco resident took a video from her rooftop before any of the rescue crews arrived. An early report was that the boat caught fire, but it now appears to have been steam coming from the boat.
"There was still steam coming out as the water was finally making its way into the engine compartment, that's where the steam was coming from."
The Coast Guard confirmed this on Wednesday.
"There was no evidence at the time of a fire of any kind. What it does appear is that the vessel took a wave and was listing heavily and lost a little bit of stability, and then it quickly rolled over."
From the air, the Volare looked like a pontoon boat going down, and fire officials said it was a pontoon boat. We now know it was that three-level 49-foot motor yatch, now resting 120 feet down in San Francisco Bay.
The Coast Guard said it would try to raise the Volare once the boat is found. It's a possibility that any one of the three missing may still be on the boat.