How do mermaids map ocean currents?

Humans lay road to gain fast access to distant places until aeroplane is invented, I would presume the mermaids living underwater can make use of the strong water current to get around the ocean quickly. The issue is unlike road these currents changes shape and direction frequently so how can the mermaids get to its destination accurately without trial and error using our 21st century technology?

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How do mermaids map ocean currents?

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