ETA Calculator：船員のための正確な航海計画

ETA Calculator is a simple offline navigation tool for seafarers. It helps maritime professionals with voyage planning, passage scheduling, and time management at sea. Main Functions 1. Estimated Time of Arrival (ETA): Enter distance and vessel speed to calculate expected arrival time. 2. Required Speed: Enter distance and desired arrival time to calculate the necessary speed. 3. History of Calculations: All previous ETA and speed results are automatically saved for quick reference. Useful For: - Bridge watch officers - Masters and chief officers - Students and cadets in maritime training - Anyone involved in time-critical passage planning Features: - Works fully offline, no internet required - Fast, accurate results with a clear interface - Light & dark themes for day and night use - 24-hour time format, matching maritime standards ETA Calculator is designed for all vessel types and sizes — from training simulators to real-world navigation. Reliable, accurate, and easy to use.