A TFT is manufactured using at least five photomasks in a conventional liquid crystal display device, and therefore the manufacturing cost is high. The transmissionreception unit includes equalization means to equalize a first signal received from said remote unit and predistortion means to predistort a second signal transmitted to said remote unit. Then the use of the first input device may be enabled in the selected non-native mode. The method involves obtaining encoder information indicative of a first angular position of the telescope tube about the corresponding axis, wherein at the first angular position, the latitude indicator indicates a first latitude value.