GPS info not shown if altitude is missing
shotwell-0.31.4
Shotwell does not show image Latitude and Longitude (and a link to openstreetmap) if Altitude is missing.
This is how I add coordinates to pictures and expect to see a map:
exiftool -P -overwrite_original_in_place -GPSLatitudeRef=N -GPSLatitude=12.34567 -GPSLongitudeRef=E -GPSLongitude=23.4567 test.jpg