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Marks and Marking
Tall Marks and Masts
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adjusted Admiralty Tide Tables alidade amplitude anchor angle bar check beacon beam boat bottom calibration chart datum co-tidal chart coastline constituents correct curve Decca described distance diurnal drag sweep echo sounder echo trace equivalent sounding velocity errors false echoes fathoms feet float foul frequency frequency modulated harmonic height heliograph high water inches indicate kite kite wire knots leadline length lines of sounding logship low water lowering lines marks measured method metres modulated moon mooring necessary º º obtained Oropesa Sweep otter paper period phase plotted position lines possible pulse radar range recorder reduced scale sea bed Section semi-diurnal sextant ship ship's shoal sinker skywave sonar sonar sweeping sounding datum sounding velocity speed station pointer stylus surveyor sweep wire theodolite tidal flow tidal stream tide gauge tide pole tide raising force Tide Tables transducers transmission transmitting vertical vessel whilst wreck zero