 The Others transmit a signal that they use to locate the Island.The Island is surrounded by a shield of electromagnetic energy, which causes temporal displacement and death when trying to enter or leave the Island, unless the person is traveling from a certain angle and bearing (which changes when the Island moves).The DHARMA Initiative located the Island, after learning about it through the United States Army, by building The Lamp Post, an off-Island station underneath a church, over a pocket of electromagnetic energy that uses the energy and a complex mathematical equation to locate where and when the Island will be.