On all my trips with Explorer Venture boats I've left about 15%.
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On a week long trip then, it's between $315 to $560. Call me cheapskate but I could see going with any value between the two based on how well the staff did in meeting your needs and how much you've got in the bank.
You're talking per-person, right?
That seems pretty high, but I guess it depends on the number of crew and number of days you're sailing. I guess price of the live aboard is also a factor. If you're on a $1500 trip with 6 crew members a 40% tip seems incredibly generous.We've done a fair number of liveaboards, and our tip usually starts at $100 per crew member. So, 8 crew would be $800. We go up from there depending on the quality of the service, whether or not the DM's were good and attentive, if they paid attention to special requests, etc.