The "Course Calculations" information board is an essential tool for anyone involved in nautical calculations. It provides a clear and concise presentation of course calculations, suitable for both beginners and experienced users. The board allows for the calculation of the annual variation of declination and the conversion of true courses into magnetic compass courses. Thanks to its robust and waterproof lamination, it is ideal for use in challenging conditions, whether on board a ship or in training sessions. The ability to make calculations directly with an overhead marker, along with the provided course information, example calculations, and tips, makes this information board a practical companion for anyone looking to perform precise course calculations.