Winlink 2000...HF email and communication, Ham radio license required
  Airmail...a program for email  via SSB radios and high frequency; both ham and non-ham
  SailMail...a non-profit providing email over SSB; no Ham radio license required
  Panbo...good web discussion of marine electronics
  MarineComputingSystems....very good marine electronics out of Portland, Maine
  Yotreps...position plotting over SSB radio...free
  ShipTrack....position plotting via ham Call sign...free
   
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