SEA CALCULATOR
Tidal window
Tidal window worksheet using low/high tide times and heights.
Enter low/high tide times (hours from midnight, decimal) and heights from the official tide table for your port and date.
Values still match the built-in demo curve (LW 02:00 / HW 08:12 / LW 14:30). Edit them from your tide table before saving to the plan.
Window opens ≈ 5.684 h
Window closes ≈ 10.821 h
Estimate only, from a standard published method. Check against your ship's data, the official publications and your company procedures.