Rockwell-Collins (ARC-210) and Wulfsberg (RT-5000) offer systems that have both aeronautical and marine band capabilities. Both systems have quite a few additional options and variations. Both are expensive (recently purchased a used ARC-210 system for around US $40,000). If you are looking to just add marine band capabilities to your aircraft, there are many choices for a small inexpensive marine band transceiver. Also, I believe the Collins and Wulfsberg systems are subject to US export control.