290 NAUI Master Scuba Diver INDEX W Waterway rules ........................................................264-266 Wave diffraction ................................................................36 Wave refraction .................................................................36 Wavelength ..................................................................34, 97 Waves ...........................................................................34-40 Weather conditions ...........................................................47 Weight belt, ditching ..............................................181, 182 Weights, buoyancy and ...................................................182 Welded aluminum boats, boat diving and ....................259 Wet suits, deep diving and .............................................237 Whipping, knots and ......................................................270 Whistle, communication with ........................................230 White light .........................................................................97 Whitecaps ..........................................................................35 Wind ...................................................................................45 Wind currents ....................................................................44 Wind scale, Beaufort .........................................................35 Women and diving ..................................................137-139 Wooden keels, inflatable boats and ...............................258 Woolly bears ......................................................................27 Work, energy and ..............................................................68 Working pressure ............................................................6, 8 Workman-U.S. Navy decompression model .................155 Wrist seal, dry suit.............................................................26 Wrist-mounted compass ..........................................23, 199 Y Yachts, boat diving and ..........................................260, 261 Y-valve ...............................................................................10 Z Zero, absolute ....................................................................75 Zippers, waterproof .....................................................26-27 Zooplankton ......................................................................51
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