DIRECT ANSWER
Steam Deck support is not currently confirmed by an official compatibility rating in the sources checked here. Treat it as experimental and test the free demo before buying.
Safe test plan
Use the demo to check the parts that matter to you.
- Controller glyphs and menu navigation
- Engine startup and bridge interaction
- Rudder and throttle neutral
- Readable cockpit displays
- Frame rate in a busy harbor
- Suspend and resume behavior
Do not infer support
Controller support alone does not guarantee a complete handheld experience. This page will change when Valve or the developer publishes a verified status.