I see periodic compensation all the way between waypoints, but had until now thought it was only compensating for low heading resolution. I've also noticed that speed varies, but this could just be wind. What has happened to me, however, is destroying my ship on sandbanks that aren't on the map. It could just be they're really small and I've been missing them, but this happens in areas I've sailed through several times, and it could be tides. I think I'm going to hang around some shallow waters and prod the depth for a couple of days now to do some testing.
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