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Many people use these terms interchangeably, but in navigation they have distinct meanings.
Current is the general horizontal movement of water.
Tidal Stream is a type of current caused by the rise and fall of the tide.
Set tells you the direction the water is flowing toward, while Rate tells you how fast it's moving.
Understanding these concepts is essential for:
Voyage planning
Accurate chartwork
Collision avoidance
Predicting your vessel's actual track and speed over the ground
Even a relatively weak current can gradually push a vessel miles off its intended course if not accounted for.
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