what I was told on Tonga, was that in addition to things mentioned already like birds and waves bouncing off land. Such as, feeling turbulence, or a “wake” thrown off by islands as the ocean currents cut around them. you sail into that, feel it, and follow it to land. Then another thing was, apparently, there are relatively consistent swells that come from the same direction, we don’t notice them because of all the surface waves, but the skilled navigators could pick them up and use them as a reference, I think also they might get disturbed or blocked by a land mass, not so sure about that last bit, or any of it, I went to Tonga once and it was badass
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