After completing the puzzle:
1. Group all the like colours together and unjumble them
2. Now arrange them in Red Yellow Green Blue
3. Do the opposite to them to what you did to complete the puzzle
4. Cross off the very last digit and slot in South and East in the appropriate positions
You now have the coordinates for the OLD GZ... but due to construction nearby...
I have moved the cache 8 metres away... so offset the solved coordinates by taking 0.004 from South and taking 0.002 from East
Checksums: South...29 East...20
You will need to bring a pen, please put back exactly where you found it and good luck!
*** Congratulations go to Muppet95 for FTF! ***