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Originally Posted by Roguish Lawyer
Perhaps there are other things to be discussed also, but I was watching something this morning that made me wonder how I should adjust for current while navigating underwater. Assume no equipment other than a compass.
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As with anything, it's speed, distance and direction. Underwater a swimmer is limited in distance but it all works the same under and above water. The navy has tide charts that you use to figure the direction and speed of the current. You take the target's location, back out the distance and direction you'll be swimming/boating and then move the drop off point upstream into the current the required distance. When you are dropped off you are not swimming/boating for the target. You are moving on a compass heading. The current drifts you into the target.
The key is time. Too fast and you hit short of the target, too slow and you hit way long of the target. This is where practice comes in. A team can spend a great amount of time working out loads and doing speed/time runs all for one run into the beach.
Pete
Of course in the new age we have GPS. Now you could just say "Go thata' way."