Commerical diver John Chatterton uses the following tips to keep navigation simple.STROBE LIGHTS or Cyalume sticks at critical navigation points.IDENTIFICATION of specific locales within the ship. This comes from experience of intimate knowledge of the wreck.MAGNETIC COMPASS: know the lay of the wreck and the direction you're traveling.PENETRATION LINE (a ''pen line'').LINES OF THE WRECK. Follow naturally occurring lines like a seam between a deck and a wall, a pipe or a cable.EXACT DEPTH. Know the exact depth of landmarks, exits, tie-ins and other key navigational points ''At any given time, I will have, at the very least, two methods employed,'' he says.
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