Nautical Calculator Pro
Giacomo Gabriele
About this app
- Category Tools
- Age 10
- Updated Sep 10, 2025
- OS IOS / Android
Editor reviews
Nautical Calculator Pro is a professional marine navigation and voyage planning app for captains, sailors, and offshore crews. It quickly solves course, speed, distance, time, and ETA, converts between true and magnetic headings, and helps plan safe, efficient routes. Built for reliability at sea, it works offline, supports metric and imperial units, and offers fast, cockpit-friendly input. Ideal for boating, yachting, regattas, and coastal cruising with keywords like marine navigation app, boating calculator, voyage planning, ETA calculator, GPX export, offline tools.
Core features include navigation calculators for CSDT and ETA with rhumb line and great circle options, magnetic and true conversion with adjustable variation plus set and drift and cross track error tools, and route planning with waypoints, vessel profiles for speed and fuel, unit conversion, offline use, and GPX export.
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How to use:
1. Download and open the app, then choose your units, theme, and language. Optionally create a vessel profile with cruising speed and fuel burn rate.
2. To compute course, speed, distance, time, or ETA, open Calculators, enter any two known values such as speed and distance, and the app calculates the missing field instantly.
3. To convert headings, open True Magnetic, enter your heading, set local variation manually or from your position if available, and view the converted result.
4. To plan a route, add waypoints, choose rhumb line or great circle, review total distance, travel time, and estimated fuel, then save the plan or export GPX for your plotter.
5. Use advanced tools such as Set and Drift, Cross Track Error, and Turn Radius to refine your course, then save frequently used setups for quick offline access.