Lists all EXIF GPS tag identifiers.

Values:

IGMDTAG_ID_EXIF_GPS_VERSIONID	GPS version ID.
IGMDTAG_ID_EXIF_GPS_LATITUDEREF	GPS latitude ref.
IGMDTAG_ID_EXIF_GPS_LATITUDE	GPS latitude.
IGMDTAG_ID_EXIF_GPS_LONGITUDEREF	GPS longitude ref.
IGMDTAG_ID_EXIF_GPS_LONGITUDE	GPS longitude.
IGMDTAG_ID_EXIF_GPS_ALTITUDEREF	GPS altitude ref.
IGMDTAG_ID_EXIF_GPS_ALTITUDE	GPS altitude.
IGMDTAG_ID_EXIF_GPS_TIMESTAMP	GPS time stamp.
IGMDTAG_ID_EXIF_GPS_SATELLITES	GPS satellites.
IGMDTAG_ID_EXIF_GPS_STATUS	GPS status.
IGMDTAG_ID_EXIF_GPS_MEASUREMODE	GPS measure mode.
IGMDTAG_ID_EXIF_GPS_DOP	Measurement precision.
IGMDTAG_ID_EXIF_GPS_SPEEDREF	GPS speed ref.
IGMDTAG_ID_EXIF_GPS_SPEED	GPS speed.
IGMDTAG_ID_EXIF_GPS_TRACKREF	GPS track ref.
IGMDTAG_ID_EXIF_GPS_TRAK	GPS track.
IGMDTAG_ID_EXIF_GPS_TRACK	GPS track.
IGMDTAG_ID_EXIF_GPS_IMGDIRECTIONREF	GPS img direction ref.
IGMDTAG_ID_EXIF_GPS_IMGDIRECTION	GPS img direction.
IGMDTAG_ID_EXIF_GPS_MAPDATUM	GPS map datum.
IGMDTAG_ID_EXIF_GPS_DESTLATITUDEREF	GPS dest latitude ref.
IGMDTAG_ID_EXIF_GPS_DESTLATITUDE	GPS dest latitude.
IGMDTAG_ID_EXIF_GPS_DESTLONGITUDEREF	GPS dest longitude ref.
IGMDTAG_ID_EXIF_GPS_DESTLONGITUDE	GPS dest longitude.
IGMDTAG_ID_EXIF_GPS_DESTBEARINGREF	GPS dest bearing ref.
IGMDTAG_ID_EXIF_GPS_DESTBEARING	GPS dest bearing.
IGMDTAG_ID_EXIF_GPS_DESTDISTANCEREF	GPS dest distance ref.
IGMDTAG_ID_EXIF_GPS_DESTDISTANCE	GPS dest distance.
IGMDTAG_ID_EXIF_GPS_PROCESSINGMETHOD	GPS processing method.
IGMDTAG_ID_EXIF_GPS_AREAINFORMATION	GPS area information.
IGMDTAG_ID_EXIF_GPS_DATESTAMP	GPS date stamp.
IGMDTAG_ID_EXIF_GPS_DIFFERENTIAL	GPS differential.