ETACalc

ETACalc is a purpose-built tool designed for mariners who need accurate, fast, and practical voyage timing estimates. Whether you are planning fuel-efficient passages, comparing alternative speeds, or working out a reliable clock-change schedule, ETACalc simplifies the process of calculating Estimated Time of Arrival (ETA) and Required Speed.

🔒 Fully Offline – No Installation Needed

• 📂 Excel-based – runs directly in Microsoft Excel, no extra software.
• 🌐 Works completely offline – no internet connection required at sea.
• 🖥️ No installation – just open the file, start calculating.
• ⚡ Lightweight & portable – carry it on any laptop or USB stick.