Time-Varying Tidal Stream Vector & Rule-of-Twelfths Channel Crossing Solver

Deterministic Time-dependent Zermelo navigation ODE with harmonic tidal current field (Rule of Twelfths / sinusoidal quadrature) engine (.json, .csv, .gpx) built for Navionics, TimeZero, Orca Navigation, Savvy Navvy — zero-upload ephemeral Wasm RAM execution.

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