This is a nine SWITCH puzzle. Not to be confused with the nine BUTTON puzzle if you GOOGLE it.
Pengi has built a box with nine switches and an 8x8 LED display.
Each switch when flipped will show a different symmetrical pattern of illuminated LED's.
If you flip two or more switches the LED's change according to the logic: -
On + On = Off
On + Off = On
Off + Off = Off
When all switches are OFF then no LED's are illuminated.
What you have to do is flip a number of switches ON to light all the LED's.
The order in which you flip switches makes no difference.
When all LED's are illuminated then put the letter codes in alphabetical order and check with Certitudes to get the final co-ordinates.
Good luck.
You can validate your puzzle solution with certitude.
Well done nofs for solving and finding. For those who are struggling I have a simple spreadsheet tool for you to play with to help solve it. There are not as many combinations as you may think. No macros or hidden codes in this worksheet and it has been virus checked.