No, I don't keep secrets from my partner. But we do hold each other's privacy as sacrosanct, which requires a balance. We are monogam-ish and currently want things to stay that way. When one wants monogamy, the implicit corollary is assumption of all responsibility for a partner's sexual satisfaction. The "mono" and "-ish" parts require maximum reasonable transparency, communication, and self-awareness so that we are all fulfilled and and informed.
Through a few decades of dating and many imploded relationships, I have found that being open with my partners is the surest way to get exactly what I want. And I'm seriously twisted and pervy.
The maintenance on the steel hull would require a return to territorial waters, at which point you'll need registration (read: taxes). The tender you use to resupply would also require registration and often insurance to enter into marinas.