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

- Two Ship Types
- Two Difficulty Levels
- Night Mode
- Distance Of Track Calculations
- Duration Of Attack Calculations
- Guided interactive tutorials
- Review of maths calculation after every round

Full version features:
- Another 3 ship types
- Hard and Perisher difficulty modes