GPS coordinate converter (DMS, decimal, UTM)

EXIF 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.