Page 35: of Maritime Reporter Magazine (June 15, 1969)

KNOTS FORE PORT<« STBD KNOTS STERN "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- / > y 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. Just how slow is slow? MARQUARDT DOPPLER SONAR TAKES THE HAZARD OUT OF CRITICAL DOCKING MANEUVERS I^STBD 1.2 1 mn\ KNOTS MARINE ELECTRONIC PRODUCTS ? THE MARQUARDT CORPORATION "A CCI MARQUARDT INDUSTRY" 16555 Saticoy Street, Van Nuys, California 91406 June 15, 1969 37