High Seas — a real boat & ocean physics simulation

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WASD / arrows: throttle & rudder · Q/E: bow+stern thruster (strafe) · click water in RTS / Diablo / top-down to set course

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slide to unlock

Camera

Real location

Time & sea

Time speed60×

Sea state25%

Wind dir235°

Sea state scales the real Gerstner wave amplitudes AND the real wind speed used for windage (rougher seas = stronger wind, Beaufort-correlated). Time speed accelerates the real sun/moon/star clock only — wave and boat physics always integrate in real time for stable, honest handling.

Real deep-water dispersion (ω²=g·k), real per-point Archimedes buoyancy (F=ρgV), real engine/rudder/bow+stern-thruster forces, real solar & lunar ephemeris, real shadow map, real planar reflection, real 8,808-star catalogue. Hand-written WebGL2 for this repo — no dependencies, no CDN, no build step. Test hook: window.__seas.