Periscope Watchkeeper app for iPhone and iPad

Whether you are a current submarine periscope operator, bridge staff or intend to join the silent service in the future this game provides training in the essential skill of determining another vessels aspect (ATB) as well as calculating the Duration of Attack and Distance Off Track. Features:

- Five ship types (Arleigh Burke, Zumwalt, QM2, Daring class and a cargo ship)
- Four difficulty levels for the ATB game mode
- Up to three targets for the passive range and look interval mode
- Night mode
- Distance Of Track calculations
- Duration Of Attack calculations

Any feedback, customisation requests, bug reports or general comments are all welcome.