As long as the system is not in use for IT or other communication services, you have an incredible set-up for receiving satellite TV and Radio! Nothing unique or proprietary about the system as was previously suggested. This is just a super deluxe version of in-motion stabilized dishes that are found on RVs. Just confirm the system is not in use with your ship's communication officer before swinging the dish to another satellite!
You will have many options for viewing free to air programming without the need for subscribing using your existing LNBs. Orbit can supply other LNBs suitable for many subscription services if you wish to invest in a subscription specific receiver. Many free to air receiver options will work for viewing in the clear channels, GEOSATpro, Amiko, Openbox, etc. These units will receive FTA channels from most satellites in the world. Verify with Orbit the correct cable connections, LO and polarity control settings before attempting to connect a DVBS S2 receiver to the system.
Different satellites provide coverage to different areas. Websites such as lyngsat and sathint are great resources to find out what satellites and channels are available in the region.
What are examples of areas that you cruise? We could suggest satellites and channels that you could receive.