Very mixed reviews on this Igloo ice maker thing. Everybody consistently says the ice is wet and the storage container (obviously) is not a freezer, so the ice is melting as soon as it is made. It works better when it is cooler to begin with (after it is running for awhile). About half the reviews say that the thing breaks down and stops working in a relatively short time period. Returning a broken one is a pain. It is best used when ice is put into a cooler relatively quickly. If you transfer ice into a freezer, the ice cubes re-freeze into a block. Lot's of people solve this problem by transferring ice into ziplock bags that they can bang on the counter to release individual cubes after they have re-frozen together. Organic growth is a problem when it is stored, so getting it completely dry before storage is imperative.
I'm guessing that it would be a crapshoot if it is good or bad - especially in a boating environment. There is probably a better than even chance that you might get a few uses out of it before it gets disposed. If you can throw away $100 casually, it might be worth a try! Most of the positive reviews were written as soon as the machine was used right out of the box … in a home environment.