DESCRIZIONE
To easily grasp a relationship of parameter values which influence a log velocity of a ship, with the log velocity of the ship caused by the parameters, a ship characteristic estimating device (9b) is provided, which includes a data output unit (6) configured to output a plurality of parameter data (D1, D2, D3, ..., ) respectively including rotational speed data (R1) of a propeller of a ship, and wind velocity vector data (VWD1, VWD2, VWD3, ..., ) of wind force that may act on the ship, and an estimator (12) configured to receive the plurality of parameter data (D1, D2, D3, ...,) outputted from the data output unit (6), estimate values corresponding to the respective parameter data (D1, D2, D3, ..., ) to be log velocity vectors (VWT1, VWT2, VWT3, ..., ) of the ship, and output them as first output values. The rotational speed data (R1) are same as each other and the wind velocity vector data (VWD1, VWD2, VWD3, ...,) are different from each other. [Image Omitted]