註釋 The concept of definitive maneuvers is introduced as a means for providing numerical measures of handling qualities of surface ships which can ultimately lead to objective standards and specifications. Data derived from three basic types of definitive maneuvers, the spiral, overshoot, and turning circle, are presented to indicate the extent to which handling qualities differ among existing ship types that have been evaluated. Tentative criteria are proposed to serve as interim standards for selected qualities until more complete and systematic data become available. It is recommended that the effort to accumulate data be expanded to include numerical measures of wider variety of handling qualities not only for existing ships but for research designs with near optimum stability and control characteristics. (Author). 