Periscope Watchkeeper vs Master

The only publicly available submarine periscope training application focused on "eyes only" skills. Suitable for new submariners or those refining their skills. Features: - Seven target types: Arleigh Burke, Zumwalt, QM2, Daring class, Sigma, 052D, and Gorshkov - Four difficulty levels for the ATB / AOB game mode - Up to three targets for the Passive Range and Look Interval mode - Night mode - Distance Of Track calculations - Duration Of Attack calculations - Guided tutorials for every game mode and configuration Any feedback, customisation requests, bug reports or general comments are all welcome.

Master-Nav is a progressive COLREGS learning system developed by a Master Mariner. The COLREGS are notoriously difficult to learn and retain — Master-Nav makes it significantly easier through an interactive system built around how your brain actually works. Instead of guessing through random question banks, Master-Nav guides you step by step through every rule from start to finish. Wrong answers are revisited until the rules stick — properly. Complex regulations are broken down into learnable chunks — bite-sized sections supported by mnemonics, memory aids and interactive visuals designed around how the brain actually retains information. Every incorrect answer is shown graphically alongside the correct one — immediately clear, no confusion. And with a single tap, the relevant COLREGS rule is accessible from any question at any time. Master-Nav covers COLREGS Parts A to D — General, Steering & Sailing, Lights & Shapes and Sound & Light Signals — plus Annex IV Distress Signals. Over 1000 questions in multiple formats, with a dedicated Practice Section that tracks right, wrong and unanswered so you always know where to focus. COLREGS — the easy way.