OpenWater — real top-down ocean boat sim

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W/S or ↑/↓ throttle · A/D or ←/→ rudder · Q/E bow thruster

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slide to unlock

Sky & sun instrument

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Real position

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Time

Speed—

Sea state

Calm→Storm28%

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Navigation

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Shuttle between the two real waypoints. Rudder needs way on to bite; the bow thruster only nudges you sideways at low speed — real boats can't strafe at speed, and neither can this one.

Real sun: solar declination → day length → altitude/azimuth for your chosen latitude and the simulated clock. Real sea: four dispersion-relation swell trains + wind chop, sampled at bow/ stern/port/starboard to drive real spring-damper buoyancy. Real boat: throttle thrust, speed-gated rudder authority, low-speed bow thruster, quadratic drag, real wind. Self-contained, no dependencies.