TVMDC Sailing & Marine Navigation Calculator

TVMDC Sailing & Marine Navigation Calculator is a specialized iPhone app crafted for sailors and navigators who want to sharpen navigation skills using nautical charts. It performs instantaneous conversions between true, magnetic, and compass bearings using TVMDC correction, calculates set and drift from two known fixes, and computes the correct course to steer (CTS) that accounts for magnetic variation, deviation, and water currents. Its strength lies in delivering precise navigational calculations with minimal setup, accompanied by a visual sailing triangle that helps users understand the geometry. Ideal for sailing students, recreational boaters, and navigation trainees who value reliability, clarity, and hands-on practice.