I agree that a book in your hand has a wonderful tactile feel (and on a boat, sometimes an odd smell
about it.) Much as a fireplace with real logs has a much better feel to it than a fake log, gas fireplace.
However, on a boat, the practicality of an e-reader may take precedence. We have on our boat probably about ten or twelve feet of shelf space taken up by books. We're both readers and both have a love of books. Certain books on a boat are important and necessary, your Chapmans, and Calders, engine manuals, instruction manuals. But your Steinbecks, and Hemingways, and Tolkiens for the vast majority of the time only take up space which could be used to store wine, rum and other essentials.
We will get one (or more likely two) for each other this Christmas. We already have downloaded many free books (books which are out of copyright). And then we'll be putting most of our books on the 'giveaway' shelf.
One of the 'free book' sites is Free Books : Download & Streaming : Ebook and Texts Archive : Internet Archive
Another is ManyBooks.net - Ad-free eBooks for your iPad, smartphone, or eBook reader
Now if I could just find a free Kindle...