Kai Mattern

Latest Release

Weather Trainer App

Marine weather skipper exams

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iPad & iPhone

Weather Trainer App

Marine weather skipper exams

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IALA buoyage B Trainer

Marine IALA B Buoyage Trainer

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Marine Rules of the Road

COLREGs Collision Trainer

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Marine IALA A Buoyage Trainer

IALA A buoys Educational study

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Marine Nav Lights Trainer

COLREG rules revision

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