The RSK Mk1 and Mini are not totally impervious to saltwater, such as an H1 or X15TN steel or titanium, or even cheaper grades of high chromium content stainless as used on may yachting and dive knives. It is not specifically designed as a yachting knife. Having said that, S30V is more corrosion resistant than any of the other high carbon stainless steels and the stonewashed surface treatment also improves on that. Other boaters have used the RSK Mk1 and Mini with no problems, rinsing with fresh water and drying after use. I just spent an afternoon in a very wet life raft off the coast of California, my RSK Mk1 was immersed in salt water for a few hours and was not rinsed off until later that day. The only indication of any corrosion was some very slight discoloration of one of the laser markings, which makes some sense as that penetrates the stonewashed surface.
If you are at all concerned, wipe the balde down with some Tuf-Cloth or Marine Tuf-Cloth see:
www.sentrysolutions.comHope this answers your question.