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Underwater paceing
To add to sdiver basically kick stroke. In this one must have a hundred meter line and swim it many times to develope a kickstroke average. it will alway be affected by currents and tides. Tank volume works for most of us because we swim enough to know about how far we can get on a full tank or two or Draeger. Pace count works best in harbors and such where it is necessary to do Dog legs to an insertion or target site. IE: 300 meters of XX azimuth 45 degrees right turn for 150 meters, then another Right turn for300 meters to a target. Pace in this cercumstance is critical. Blitz 
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