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Water motion Currents provide a sure method of underwater navigation. If you’re drift diving (ask your PADI Instructor about the Drift Diver course and Adventure Dive), the current naturally navigates for you, carrying you where it will. In most cases, however, you swim against the current, with the flow giving a constant bearing. Be aware that currents can shift direction during a dive, especially when tides change. Plan your dive with this in mind, so that the current helps you return to your