Originally posted by Ryzilynt:

Sometimes the boat will continue along it's current heading if abandoned.. but if you started back at your last spawn then idk

Update. It appears this is what happened. It did an ancient mariner sail. I'm just exploring now, sailing around waiting for the update to drop. I saw a mast and thought it was a wreck. Checked it out and it was my Karve, beat up but floating. Tough to say but it looks like it did a mostly straight line from where I CTD to a landmass, about two days sail.