GyroCop

GyroCop

Compass Error Calculator

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Free

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Details

  • Released
  • Updated
  • May 11, 2026
  • June 11, 2026
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About

GyroCop is a practical marine compass check tool designed for seafarers. The app helps officers perform celestial compass checks using the Sun, Moon, planets and bright stars. It supports clear bridge workflows for calculating magnetic course, deviation and final compass error. Main features: • Celestial compass check calculations • Sun, Moon, planets and bright stars support • Magnetic course and compass error calculation • Vessel deviation card storage • Deviation curve view • Check history and reports • Clean dark maritime interface GyroCop is designed for practical bridge use and training. Important: GyroCop is a calculation aid only. It does not replace official navigation equipment, approved onboard procedures, nautical publications, class/company requirements, or the professional judgment of the officer on watch.
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What's New in GyroCop

1.2

June 11, 2026

Magnetic compass checks just got sharper. This update adds automatic magnetic variation calculation using WMM2025 from your entered position and date, plus a new mode for calculating deviation from an observed compass course. Device GPS position entry is now smoother too: fields lock while updating, then give clear success feedback when the position is applied. Less manual math, fewer compass-card headaches.

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