Page 3rd Cover: of Maritime Reporter Magazine (March 1969)

BOW KNOTS FORE STBD Just how slow is slow? V MARQUARDT DOPPLER SONAR TAKES THE HAZARD OUT OF CRITICAL DOCKING MANEUVERS 1 t rr ? ? "All clear...dead slow, ahead!" "Talking" a supertanker into its berth or through constrictive docking areas requires precision judgment, timing, and control of speed and direction. ? The new Marquardt Doppler Sonar Docking System tells you exactly "how slow is slow." Here is a system which, for the first time, displays true ship velocity in all directions within l/100th of a knot, regardless of weather conditions or current drift. ? This unique system uses the Doppler principle ? measuring the doppler shift of sonar beams reflected from the harbor bottom. The differences in fre-quencies represent velocities?fore and aft, port and starboard?and are instantaneously displayed in knots on the panel. ? Marquardt also has Doppler Sonar precision deep water / ? navigation systems for geophysical and oceanographic research and survey appli- / cations. Your Marquardt representative can demonstrate how Doppler Sonar navigation can reduce hazards, lost time and costs in your fleet operations. Contact Marquardt today for complete information. MARINE ELECTRONIC PRODUCTS ? THE MARQUARDT CORPORATION "A CCI MARQUARDT INDUSTRY" 16555 Saticoy Street, Van Nuys, California 91406