I will live on a boat while in the US. What's my "US street address" for the customs declaration form?

I will be travelling to the US as a tourist for a few days (I have an ESTA, I'm from an EU contry). When you arrive at the border, you must fill a U.S. Customs and Border Protection Declaration Form 6059B, which the flight attendants usually give out during the flight. What should I put in the box "US street address (hotel/destination)"? I will be living on a boat that will not stay in the same port.
edit: a private boat, not commercial
Best Answer
When I traveled in the USA (a few years back) I did not have more than the first night booked, when I talked about that with the immigration officer he said I was right in putting in that first address, as that is what they needed.
So I would say that the name of the boat and the address where you get on should do for you.
When asked about it, you can explain the boat will be on the move and have the itinerary in your hand luggage, in case they want more addresses.
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How do I fill out a US customs declaration form?
CBP Declaration Form 6059B provides us with basic information about who you are and what you are bringing into the United States, such as agricultural and wildlife products and whether or not you have visited a farm prior to traveling to the United States.What is customs declaration form 6059B?
You must declare all items you purchased and are carrying with you upon return to the United States, including gifts for other people as well as items you bought for yourself. This includes duty-free items purchased in foreign countries, as well as any merchandise you intend to sell or use in your business.What must you declare at US customs?
If your boat has anchored or tied up, you are considered to have entered the United States. No one shall board or leave the boat without first completing customs processing, unless permission to do so is granted by the CBP Officer in charge. The only exception to this requirement is to report arrival.So You Want To Live On A Boat? 1st Things To Think About
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Answer 2
I actually asked an immigrations officer about this about 15 years ago (before ESTA, you filled out the same questions on a paper form on the arriving flight) as I was going to stay in 3-4 different locations during my stay in the US, and the answer was simply: Pick one, preferably one with either a resident or a hotel/motel. I've done that ever since. Nobody I've used has ever been contacted by INS or similar either so it's probably just for reference - in case it's needed.
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