Thanks to all who replied. I think I'll go with figure-eight knots every fifty feet and magic marker every ten and see how that pans out. When the viz goes to crap I'm not too worried about precision anyway. :) Don Burke NetZero Platinum No Banner Ads and Unlimited Access Sign Up Today - Only $9.95 per month! http://www.netzero.net -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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