GridConvertPro

What it does

GridConvertPro is a free, browser-based coordinate converter. Instantly convert between Decimal Degrees, DMS, DDM, UTM, MGRS and Plus Codes with a live map — plus distance & bearing, rhumb line, magnetic declination, solar times, elevation, area measurement, bulk conversion and place search. Core conversions run entirely in your browser, so your coordinates never leave your device. No signup, no install, works offline.

GridConvertPro is a free, browser-based coordinate converter and nautical calculator. Convert DD, DMS, DDM, UTM, MGRS, Plus Codes and Maidenhead grid locators. Compute rhumb line course and distance, great-circle bearing, NATO mils, Speed·Time·Distance in knots, magnetic declination, and AGL/AMSL height for marine, drone, aviation and field operations.

Convert instantly between Decimal Degrees, DMS, DDM, UTM, MGRS and Plus Codes — with a live map, distance & bearing, magnetic declination, rhumb-line and marine navigation tools. Every conversion runs in your browser, so your coordinates never leave your device. Rhumb line = constant compass course. Standard for coastal & offshore passage planning. Great circle (orthodrome) is shorter on long ocean crossings — both are shown. Enter any two values — the third is computed automatically. D = S × T · Speed in knots · Distance in nautical miles · 1 knot = 1 NM/h Chain 2 or more waypoints to compute total path distance, per-leg distance and bearing. Uses great-circle (Haversine) — suitable for…from gridconvertpro.com

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