1. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the processor, cause the apparatus to: receive selection of a landmark; determine at least one position indicator relating to alignment with the landmark from a sensing location, wherein the at least one position indicator includes at least one of an altitude of the apparatus, an attitude of the apparatus when aligned with the landmark, or an orientation of the apparatus; determine a relative position of the sensing location with respect to the landmark based at least in part on the position indicator; receive one or more other position indicators relating to alignment with the landmark from one or more mobile terminals located at other sensing locations; and determine one or more other relative positions of the one or more mobile terminals located at the other sensing locations with respect to the landmark based at least in part on the one or more other position indicators.