On board navigation requires a variety of different formulas and calculation aids. Errors can easily creep in here, which can significantly affect navigational safety. It is essential to avoid mistakes, especially when calculating chart or water depth or one's own speed. This information board presents the most important formulas and aids for course calculation clearly at a glance. In addition to the formulas, the relationships between the various courses and bearings (true course, magnetic course, etc.) as well as the calculation of the current triangle are explained in an illustrative manner. Example calculations for each subtopic facilitate understanding - therefore, the information board is suitable for practical use on board and for training on land. The information board is waterproof and tear-proof laminated, ensuring its durability.