The number of planetary types of locations is 58, for more details see https://en.wikipedia.org/wiki/Planetary_nomenclature
Number of types of locations (without XX) for Mercury - 10 - 11
Number of locations on Mercury without LF (as of 01.09. 2017) - 488 (downloads -21)
Number of locations on Mercury without LF (as of 29.10. 2018) - 509
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Update:
1. Delete the old base of Mercury locations
2. Copy and unzip the file Mercury_29-10-2018.zip
3. Place folder 01-Mercury in folder ..\extras\Locs\
4. Restart Celestia
New base of Mercury locations in the attachment:
