Fusion’s MS-AV600G ($499) is the centerpiece of the company’s line of marine stereo and entertainment gear. This one handles all the hard-media chores with a skip-protected DVD player that accepts a full range of CDs and DVDs. It’s equipped with an AM/FM receiver and is Sirius-radio ready. And it is designed especially for compatibility and networking with the Fusion MS-IPDOCK. With this addition, iPhone integration simplifies a pretty complex set of steps: Audio files stored on the iPhone can be accessed and played through the system; then, should the phone ring, you have the option of answering the call with a Bluetooth headset.