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Technological advances and the sea surveyor G S RITCHIE
The tercentenary of the Royal Observatory at Greenwich
Depth checking in fairways F WESTERBERG
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abnormal wave accuracy acoustic Agulhas Current angle average beam bottom calculated Canadian Hydrographic Service changes coast coastal contour correction correctors curve Decca determined distance doppler DUT1 echo echo-sounder effect electronic equipment errors estimation factors figure fluctuations French Francs frequency grid height Hi-Fix Hydrographic Department Hydrographic Offices hydrographic surveying International Hydrographic International Hydrographic Bureau International Hydrographic Organization knots latitude leap second length limit maps marine Matthews area maximum mean sea level measurements method metres miles monthly mean sea navigation Navy obtained ocean oceanographic operation parameters pattern photographs plotter plotting points Port Teufik position range record reflector result sea floor ship ship's shoal shows side scan sonar signals sound speed Sounding line square standard deviation stations surveyor tape techniques telesounder tidal tides tion track transducer values variations velocity vertical vessel wind