📱 Neptune's Route for Android

Take Great Circle navigation with you. Neptune's Route provides spherical and WGS84 (Karney) calculations, composite sailing, route planning, GPX and PDF export, and offline calculations directly on your Android device.

Get it on Google Play

📱 The Sailings for Android

Take your navigation calculations with you. The Sailings provides practical Mercator Sailing (Rhumb Line) and Middle Latitude Sailing calculations directly on your Android device. All calculations are performed offline – no internet connection is required.

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📱 GCVertex Calculator for Android

A compact tool for Great Circle navigation. Calculate the Great Circle distance, initial course, final course and the vertex from departure and destination coordinates. All calculations are performed offline on your Android device.

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⚓ Rolling Period Test for Android

A practical tool for performing a ship's rolling period test. Measure the rolling period using the built-in stopwatch and calculate the ship's fluid GM from the measured rolling period, beam and rolling period coefficient. Ship particulars can be stored directly on your Android device.

Get it on Google Play