The name "magnetic convention of operation" is assigned to the principle of operation of UFOs and Magnocraft, in which these starship form propelling and stabilisation forces in the result of magnetic repulsion and attraction that occurs between propulsors of these vehicles, and the natural magnetic field that prevails in the surrounding of these spaceship. In the "magnetic convention of operation" are able to fly UFOs and Magnocraft of all possible generations, types, and designs. But in spite of that, this particular convention is NOT used frequently on the Earth because in it the UFO vehicles are well visible for people, while crews of these starship (i.e. UFOnauts) try to continually hide from people their presence and activities on the Earth. Therefore most frequently the "magnetic convention of operation" is used at nights when the majority of people sleeps and also in areas deprived of human population - where UFOnauts are not afraid that someone sees them.
Here's the full article
http://dex-mysteries.blogspot.com/2009/09/ufo-vehicles-flying-in-magnetic.html