Magnetic compass error and magnetic compass correction of correct variation and deviation, whose corrections are normally aided with the formula solve tvmdc, can now be corrected with this navigation tool, the Course Conversion Calculator. Solve tvmdc is a formula, which helps when making a magnetic compass correction of magnetic compass error regarding the misalignment of true north, and magnetic north, deals directly with the magnetic compass. T = true north; V = variation in degrees between true north and magnetic north; M = the magnetic compass reading after adjustment is made between true north and magnetic north; D = deviation of the magnetic compass as it may be affected by the magnetic forces on the boat such as electronic devices and/or metal parts located near the magnetic compass. This navigation tool, the Course Conversion Calculator, also is used to convert relative bearings to true bearings and to give reciprocals. After only a few moments of experimentation with this navigation tool you will be able to solve tvmdc, correct magnetic compass error and make magnetic compass corrections of correct variation and deviation, find course to steer and convert relative bearings to true bearings easily, quickly and accurately with a turn of only three dials. A simplified explanation of true course, the magnetic compass, compass error and compass correction of correct variation and deviation and relative bearings is given on this navigation tool. A clear and simple approach to determining the conditions of set and drift is given on the reverse side of the calculator. This navigation tool also has a convenient ruler/straight edge to use when making arbitrary speed scales and drawing current vector triangles.

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