Another Android and iOS app of the same name, Nautical Chart Symbols, may be better for you.
GPS Long Distance Log is a logging app for Android - not a plotter but a good system for logging a voyage.To be prepared, learn also to navigate with just a depth finder and a chart. Remember that any electronic device can fail at any time, so don’t depend on only a chart app.
The free Course to Steer app calculates how to steer to compensate for a current and leeway from the wind.
Here's a comparison of 5 Android apps for boat charts and navigation to help you choose the one best for you.Two free Android apps (initially free, at least) are Marine Charts Lite and Marine Charts HD and NutiCharts Lite, but \weI cannot recommend either for much use on the water.Navionics Marine & Lakes has some interesting features and uses vector charts.MX Mariner is another fine app using raster charts.Memory-Map has the fullest navigating features for Android devices.