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If you right click on one of the geo-locations (Sublocation, City, State, Country) and then select the valid choice, the text switches from gray to white (indicating you have accepted the geo-location as correct) and then I believe the information is usable in Slideshow.
In my opinion, this is a poor design, which requires a lot of manual interaction, and so I don't use the Lightroom Map Module to apply GPS coordinates and locations to my photos. I use a freeware program called GeoSetter which has a much nicer interface and design than what you see in Lightroom. Once you geo-locate a photo in Geo Setter and then save the metadata to the files (or xmp in the case of RAW), you can read this information into LR via the command Metadata->Read Metadata from Files. If you are going to do this, first turn on the Lightroom option to automatically write metadata to XMP.
Thank you very much. Very helpful.
When you export pictures, geo-location is carried over to the picture file even if you do not convert Google Maps results into values before. So, I thought it would work the same with the diashow module, but apparently it doesn't. Looks to me like a programming flaw, at least, this is inconsistent design.