The narrator states the ship is at 370 North latitude and 18 West longitude. While the longitude meridian is in the eastern Atlantic Ocean (The Prime Meridian, 0 degrees, runs through Grenewich, England.), there is no such thing as 370 latitude. Lines of latitude run from 0 to 90 degrees, from the Equator to the Poles.
In the mutiny scenario depicted, the crew is shown retrieving revolvers far more modern than were available in 1872, the year of the ship's disappearance.