No information is available yet on the ARK Wiki for the co-ordinate conversion multipliers and offset for lat/lon co ords on Crystal Isles but I've taken a guess and it's not perfect but got it pretty close.
http://www.miragesoftware.co.uk/ARK/Apps/ARKViewer42.zip
Bug Fixes
SFtp download did not delete files when not using Synchronise mode.
Crystal Isles co-ordinate system way out. I have improved it a lot but it's not perfect until the Wiki is updated or somebody else works out the exact base values I need.
Features
New Crystal Isles map from the Wiki
Btw the lat/lon calculations use the following:
Lat Shift (LaS), Lat Division (LaD), Lon Shift (LoS), Lon Division (LoD)
These are specific to each map. For the Crystal Isles I guessed/approximated at:
LaS = 50, LaD = 15250, LoS = 50, LoD = 17000
Then using these settings the Lat/Lon is calculated using in-game X/Y/Z (CCC) as follows:
Lat = LaS + Y / LaD
Lon = LoS + X / LoD
.... somebody good at math can probably sort me out with the exact values needed on Crystal Isles but I'm happy to wait for the Wiki to be updated.
https://ark.gamepedia.com/Coordinates#Coordinate_Transformation