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Being an inland navigator, I started contributing to I liked their easy to use editor in first place. Digging deeper, I noticed the well structured tagging-scheme approach of OSeaM and switched to JOSM as an fully featured editor. Back in 2010 I started supporting OSeaM:

End of 2014 I lost confidence in OSeaM's code of conduct. Visit my last post at developer mailing list to get an idea about my frustration... Time to change, lets start this fork!



  • promote seamark tagging scheme
  • serve seamark-tiles and related raw data
  • map as entry page and showcase
  • maintain documentation (tagging scheme, on- and offline usage)
  • support mappers and users
  • building community around free and open nautical charts