Times change -- vocabulary too I see..
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RL - Porpoising (QRQ30's suggestion) is also (properly) referred to as a tactical peek. Definitely not the school solution if you're trying to pass the CDQC but it is the most accurate. Unfortunately, it requires considerable practice to do it effectively
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Not my solution but what we taught. Swimmers were allowed one porpoise within the first couple of minutes of the swim to assess their compass heading. On long swims they were allowed an addidional porpoise. Currents tend to be litoral or parallel to a beach. I have seen times when the curent will change direction by 180 deg in a swim. The "balls to the wall and kick like hell" is for training. Have you ever noticed how many run out of air on a 2000 M swim? Don't forget where that 80 lb rucksack comes from once you are ashore and ready to BEGIN your mission. You pulled it along with iyou.
Again as Pete said, for actual operations the visibility is at or near zero. It was always fun to reach down and grab the compass man's leg on a real dark night..