What is a primary use of the TVMDC formula in navigation?

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The TVMDC formula is a critical tool in navigation that is specifically designed to help mariners convert compass readings to true course. This transformation is important because compasses can be affected by magnetic variations, which can lead to inaccuracies if one is solely relying on the compass direction for navigation.

By using the TVMDC formula, navigators account for variations such as true heading, variation (the difference between magnetic north and true north), magnetic heading, deviation (the error in the compass reading due to local magnetic fields), and compass errors to arrive at a true course. This process enables a clearer understanding of the vessel's actual path over ground, which is essential for safe navigation and proper plotting on nautical charts.

While options related to route planning, determining speed made good, and calculating fuel consumption are important aspects of marine navigation, they are not directly linked to the primary purpose of the TVMDC formula. The formula is specifically tailored for handling compass-related conversions, making it indispensable for accurately plotting a true course based on compass readings.

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