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FYI
I was just clicking around trying to get wave data and I tried the GMN link off the weather tab as it had wave data.
I was getting "Unintelligble request" error no matter what information I checked off.
I was in the Indian Ocean and maybe that is not a covered area. So unclear if that is the issue or something else I might be doing wrong.
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I always found their email service to be more reliable.
For current, try RTOFS from Saildocs.