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Jack, I assume you will agree to take the bearing at the downline before reaching ground/ wreck, to get the direction of current , just in case you have to abort the dive and ascend in free water. At the site, you will watch how/ if the bearing changes because of magnetic influences. In many wrecks a compass is still helpful. Kind regards Matthias > > Al,not wishing to ruffle any feathers here but, G eorge is right (as > usual). You descend on the wreck(dive site), vis is shit, maybe 3ft/10ft. > First, orientate yourself and buddy. Take a bearing from compass, lets say > its 090 degrees, which means you are heading east.Now before the dive you > already know the lie of the wreck, i.e. east/west, north/south etc.So its > easy to corellate the reading on compass to true.So you head off on your > bearing, checking direction as you go, time as well.Return on reciprocal > bearing, 270 degrees ,adjusting as you return. > In shit vis you should be reeled off on shot line as well,your compass is > your back up.Always take a bearing in case your line breaks/gets severed on > sharp edges. > Change in bearing should be timed off and return in elapsed time on > reciprocal bearing to pick up original bearing, allowing for current run > etc.Guys sail around the world using these gizmos, been doing it for > hundreds of years now, still works regardless. Best, Jack. > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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