The only mystery of the Bermuda triangle is people want to see a mystery and fail to see the facts.
The Bermuda triangle is the most travelled spot on earth by air or sea. More ships and air craft have either passed through it or over it than any other spot on this planet.
Compared to the amount of traffic in that area the number of disappearances is almost non-existant when compared to nearly every other location.
In addition the number of unexplained disappearances is very small. In most cases the explanations have been ignored as they do not make good reading.
The old magnetic compasses were unreliable from the day of the first metal hull ship. A ship's metal hull will throw a magnetic compass off. There have been no compass errors since the development of gyro compasses, which are the only compasses that can work accuratly on metal hull ships and aircraft.