Thank you guys, but the problem is not Blue Cathedral!
I know exactly where it is, and what is the exact location! (I am the only dive center here! )
Blue Cathedral is good to work with (in order to find out what coord it is) , because I have both: UTM and normal coord.

But I have a list of old dive sites, with old names. I would like to localisate them.
and all sites have the same format.
But when I want to convert the UTM to normal, it does not fit...and Blue Cathedral is a good example.
arghhhh, not easy...
and I can not post a photo...it does not work