I have just bought a Canon EOS 5D Mk iv which has built in GPS and auto tags images (provided that the function is turned on.)
With RAW images which have been tagged by the camera, it seems impossible to edit and save changes to the GPS metadata in Bridge or Lightroom successfully (why would i want to is a different question but largely because it lacks accuracy some of the time.)
Edited data is recorded in the associated XMP file, but Bridge is reading the original data from the image itself, and ignoring the XMP file.
One solution is to convert the images to DNG before making edits then there is no problem with editing and saving the metadata.
Using DNG files creates one issue. Namely that, should the original RAW file be extracted from the DNG in the future, it contains the ORIGINAL metadata and not the EDITED version.
Consequently DNG and RAW images have different GPS metadata which is potentially confusing.
I can't see a solution to this.
It's not a major issue but something perhaps to be aware of.