Remote control unmanned boat and remote control device

This invention concerns a romote control unmanned boat (10) which can be freely operated by remote control and a remote control device (20). The remote control unmanned boat (10) comprises a propelling power source (11) for generating a propelling power, a steering device (13) for freely varying the direction of advance, a first transmit-receive antenna (24) for receiving the signal transmitted by ratio from a control device (20), a first controller (15) for controlling the propelling power source (11) and the steering device (13) based on the signal received from the first transmit-receive antenna (14), a memory device (17) for memorizing the initial position set in advance, and a GPS antenna (16) for receiving the electric wave transmitted from an artificial satellite. The first controller (15) calculates the present position based on the electric wave received by the GPS antenna (16) and, when the stated condition is satisfied, initiates automatic control of the propelling power source (11) and the steering device (13) so as to attain regression to the initial position based on the present position and the initial position. Thus, the remote control unmanned boat has no possibility of being missed.