Here in Dallas/Ft. Worth we dont have many cruise liners. But we do have river boats and I have performed on a couple of them. Keep in mind the dance floor as the others have suggested. Usually most rental places say to figure 9 square feet per couple, which is one 3x3 section. But I have found that with slow songs the couples take up less room whereas with fast songs they spread out more. The boats I have been on didnt have portable dance floors. Instead we used the decks so if the floor got too crowded we just move the tables aside.
Another point to keep in mind is power. Some smaller boats havent enough amps to handle a DJ with all the other items. Make sure the DJ equipment isnt on the same circuit as a heating or refrigerating unit. These draw a lot of amps and could cause a blackout or brownout. A typical DJ unit might use 15 to 20 amps, if that much.
On one riverboat I was required to set up speakers on 2 level, with the main system on the top. It was hard to see what was going on below, inside, so it kind of handycapped up. And wiring may also be tricky.
Its best to use a DJ who has been on the boat before. That way he or she would know its limitations.
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