A first determination section determines, when an instruction for connection establishment is issued, whether or not connection information including target apparatus specifying information that uniquely specifies a predetermined target apparatus is stored in a first storage section. A primary real time kinematic engine or receiver data processing system estimates a primary integer ambiguity set associated with at least one of the measured first carrier phase and the measured second carrier phase. The second stack is arranged to expose end portions of the first electrodes on the first contact region and overlap end portions of the first electrodes on the second contact region. The apparatus includes a condenser with cooled plates, and oil recovery structures. The air chamber comprises an air outlet.