A device and method for operating an in vivo imaging device wherein the illumination produced by the device may be varied in intensity andor duration, andor the gain level or other parameters may be varied, according to, for example, the amount of illumination produced by the device which is reflected back to the device. At a folded position, the arm rests are pivotally and upwardly folded towards the back supporting arms respectively so as to fold up the chair frame correspondingly, and at the unfolded position, the arm rests are pivotally folded to transversely extended from the back supporting arms so as to provide two arm resting surfaces respectively for substantially supporting user’s arms thereon. The pick up cap comprises a plurality of cutouts with inner side surfaces. The second support member includes at least one stop portion extending inward from an interior of the second support member. A second lifting conveyor is provided for receiving material from the transfer conveyor and an unloading boom is provided for receiving the material from the second lifting conveyor and for delivering the material to a receiving vessel located alongside one of the buoyant vessels. A second transport device is arranged downstream of the first transport device and has a second conveying direction substantially transverse to the first conveying direction of the first transport device.