Yes that is a primary 240V two phase electrical system with fairly minor loads covered by 120V. You don't say if you have an inverter or not but if you do I will bet it only supplies 120V to the 120V panel, which isn't all bad as the microwave and galley outlets are what most people use an inverter for.
The only downside I can see is the fact that some marinas (fairly few but may be significant) can't supply 240V directly or indirectly with two opposite leg 120V supplies Y'd together.
David
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