, incredibly free and easy.
I suggest buying
the DBPowerAmp app. There are other similar apps, but this one is very robust and flexible. I think 30 days free trial on it.
You put a CD in the drive, select the CD Ripper function, and your CD can be read and then stored as MP3, FLAC, WAV, many formats. MP3-VBR2 is nearly lossless at 1/4 the file size. FLAC is lossless. Apple formats supported too.
Rip each CD, send them to a good home. In 128GB you can store over a thousand albums at MB3-VBR2 format. That will need about 500GB in a lossless format like FLAC, either way, not expensive these days, since 128GB is just a $50 USB stick and 500GB is just a $50 hard drive. Once it is burned, make a backup copy!
Then you do what you want. You can carry 128GB in the better cell phones now. Listen on the boat using bluetooth, or a media player. Beware of 'car stereos' and other players that take SD (SD, SDHC, SDXC) cards, because they usually can only read 32GB media, or they only can read 10,000 files, or 500 directories, or some other limitation that your iPhone
or computer would have no trouble with.
Playing through bluetooth or a USB drive connection gets you past those things.
You may find the used CD's have no value. And in theory, you're supposed to retain them for copyright
purposes. But if you happen to donate them to a hospital (where they lend them out to patients, especially younger ones) or other good purpose...who's really going to argue. Not much of a tax write-off value, but a good purpose.