[Plugin: Basic Google Maps Placemarks] Enter your own Lat and Long

So i know you can enter the lat and long with a comma separating them in the address box but the numbers ever so slightly change, i was wondering what file/function to edit to allow you to just enter the lat and long myself?

I have edited the file to allow me to actually enter the numbers but obviously a funciton is still overwriting what i put in there.

Thanks
Dan

https://www.ads-software.com/extend/plugins/basic-google-maps-placemarks/