SOLVED : Drag&drop to adjust geo-location? JOSM works best for me, after trial-and-error, GPXEV and GeoSetter are good alternatives

Contributing and equipment
5

If you have an inaccurate gpx file, you can fix it with an online service accessed by a web browser.

If you have a geotagged JPG file, you can modify it with GeoSetter(Windows app).

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