Pretty much what the title says though if the goal was to make it more nuanced than just "Ship repair kit" then they could perhaps be tied to either Carpentry or Smithing to correspond to kits which repair only wood ships or kits which repair only ironclad ships. The main reasoning for this is that it's not always easy to regularly find crewman with the requisite repair skills and the map is now larger making return trips more disruptive to sailing ventures. If there's worries about spammability then... Maybe something equivalent to drunkenness for ships where after you cap the compounding repair "vital" repairs become impossible until a cooldown period has passed.
Repair Kits for Ships
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