GPS coordinate converter (DMS, decimal, UTM)
Convert between degrees-minutes-seconds, decimal degrees, and other coordinate notations - for EXIF locations and OSINT challenges.
Open in ctfpalEXIF records GPS as degrees, minutes, and seconds with a separate hemisphere reference. Mapping services want decimal degrees with a sign. Converting between them is where OSINT challenges lose people, usually to a dropped negative.
The conversion, and the sign
Decimal = degrees + minutes/60 + seconds/3600. Then apply the hemisphere: south latitudes and west longitudes are negative. EXIF stores the hemisphere in a separate GPSLatitudeRef field, so a converter that reads only the numbers puts a location in Kazakhstan that should have been in Colorado.
| Notation | Example | Where you meet it |
|---|---|---|
| DMS | 40 deg 26' 46" N | EXIF, navigation, older maps |
| Decimal degrees | 40.44611 | Web maps, APIs, most software |
| Degrees + decimal minutes | 40 26.767' N | Marine and aviation |
| UTM | 17T 630084 4833438 | Surveying, military grids |
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