Stable Speed Display in Dual Frequency Modes ♦ Ship speed measurement is insensible to bubbles generated in high-speed navigation, ensuring stable speed display. ♦ The transducer is substantially downsized,allowing it to be installed on the bow side that is little affected by bubbles. ♦ An underwater-mateable connector is adopted for the transducer, so that a transducer can be replaced at a quay even in case of its failure. ♦ The equipment is provided with an additional function of indicating the ship's fore and aft speeds and port and starboard speeds by entering GPS information. ♦ The ship's port and starboard speeds at its arbitrary position can be indicated by entering ROT information. ♦ An optimal Doppler sonar system can be configured by combining a variety of options. ♦ On-line maintenance (option)allows any failure to be detected during navigation.