The manual describes the use of, and options for, Journey Plotter Mobile.
Journey Plotter makes use of data from original Royal Navy and United States log-books that has been digitised and then made available by naval-history.netopen_in_new.
A journey can consist of large amounts of data, so it's advisable to use a WiFi connection if you're being charged for your data use.
When you open Journey Plotter for the first time, you will be asked to choose whether or not to share anonymous usage statistics.
The collected statistics will be used only to analyse which ships are viewed, and which application features are used.
If you change your mind later, you can change your preference through an option on the settings page.