The last reports seem to indicate that when it was detected by the crew, essentially the aft portion of the salon was on fire. Thy jumped down (I assume either on the side or front of the boat), and found the galley was inaccessible due to thick smoke, and the rear by fire. That would suggest to me the fire didn't start in the berths, as you'd expect that to go up the stairway at the front.
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Some modern smoke detectors also take other factors into account, such as temperature and humidity. Those may or may not meet specific code.
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Some modern smoke detectors also take other factors into account, such as temperature and humidity. Those may or may not meet specific code.