Aviation Coordinate Converter

Aviation Coordinate Converter — DD, DMS, MGRS & ICAO

This free aviation coordinate converter supports all major coordinate formats used in helicopter and fixed-wing flight operations: Decimal Degrees (DD), Degrees Minutes Seconds (DMS), MGRS (Military Grid Reference System), and the compact ICAO coordinate format used in ICAO flight plans and AIP publications. No registration or login is required — the tool runs entirely in the browser.

The tool uses a single smart input field that automatically detects the input format — paste or type any coordinate string and the converter identifies whether it is DD, DMS (with symbols), compact ICAO style (e.g. 482152N0092604E), or MGRS. There is no need to select a source format manually. Each conversion outputs all four formats simultaneously with one-click copy buttons for each.

Every converted coordinate is instantly plotted as a numbered marker on an interactive Leaflet map. Convert multiple waypoints one after the other — each new point is added to the map and logged in the conversion history below the results. Use the Street / Satellite toggle to verify the position in context. This makes the tool suitable for rapidly checking a series of waypoints (e.g. a low-level route, SAR search area, or LZ list) without switching between applications.

Decimal Degrees (DD) is the default format for GPS receivers, digital charts, mapping APIs, and most online tools (e.g. 51.1657, 10.4515). It is the easiest format to enter into navigation systems and flight-planning software. Negative values indicate South latitude or West longitude.

DMS (Degrees Minutes Seconds) is the traditional nautical and aeronautical format found on paper charts, in radio communications, and in ATC reporting (e.g. 51° 09' 56'' N, 10° 27' 05'' E). It divides each degree into 60 minutes and each minute into 60 seconds, giving sub-arcsecond precision when needed for approach procedures and obstacle reporting.

MGRS (Military Grid Reference System) is used in military aviation, SAR operations, and low-level helicopter navigation when operating with ground forces. MGRS encodes a position as a grid zone designator, 100 km square identifier, and numeric easting/northing (e.g. 32UNC6789012345). It is based on the UTM projection and WGS-84 datum.

ICAO format uses a compact alphanumeric string that encodes latitude and longitude with hemisphere indicators directly in the string (e.g. 482153N0092607E). This format is mandatory in ICAO flight plan fields, NOTAMs, and AIP coordinates. The converter outputs an ICAO-compliant string alongside all other formats.

For low-level helicopter operations — obstacle avoidance, route planning, LZ coordination, and SAR — having all four formats available in a single conversion step saves time during pre-flight planning and crew briefings. Use the Aviation Unit Converter for distance (NM↔km), altitude (ft↔m), fuel weight and volume (Jet-A1), and speed (kts↔km/h). Use the Distance & Bearing Calculator to compute great-circle distances and initial true heading between any two positions.