The present invention provides a system for remote control of a plurality of driving apparatuses with transmitters. A compass sensor module on a headgear worn by the diver has a two-axis gimbal mechanism provided with a protective housing around ring and two orthogonal axis structures. When focusing is performed with this apparatus, the target object is moved while the focus position is followed after the detection of the focus position, focus detection is performed many times and the detected signal values are averaged, and the resultant average value is used to drive the objective lens. Each block’s SERDES couples between the block’s IO circuits and the block’s set of pins. The reel incorporates formed bars slightly spiraled along the length thereof that increase the overall strength of the reel and, because of the shape of the formed bars, support plates and end plates, efficiently break up clods while avoiding plugging of the reel, even in moist conditions.