The Doppler speed log DS-80 is designed for reliable and accurate performance through FURUNO's long experience and advanced technology. It operates on the best choice of system frequency and power output. As far as the sonic energy声能 is used, the performance (accuracy) may be reduced or even lost under:·rough weather (may be sea state 6 or severer更严重的 )·improper location of sensor传感器, e.g., too close to the propeller, thrusters侧推器, drain tubes排放管, echo sounder transducer换能器，变换器·depth under the keel if less than 3 m The accuracy will not be affected by·water temperature (sound velocity)·salinity盐度·pitch/roll ±10°
Which of the following is TRUE according the above passage?