That is a navigational chart of the Marshall Islands, showing "directions & interactions of the
ocean swells as they pass through." For real. I learned this from Bonnie Queen of the Kayak Bloggers, who has a post about the chart and links to all sorts of info about these "paperless charts". Bonnie wrote:
I think
it's safe to say that almost anyone that grew up in (or has even just
spent some time in) the Pacific Triangle has seen one of these.
I grew up in Queens, New York, and most assuredly have never even imagined such a thing, much less seen one. More info at Frogma.

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