Bad No#s!
Good luck yes you need to work on finding sites, some dive shops,some operators may or may not share these prized no#s. It takes years to verify sites.
one thing don't use conversion no#s from Loran to GPS they in no way will get you on the site!
Some authors on wrecks our way the Great Lakes publish books ,sell them for big money! and have wreck site information and GPS no#s one author I leave unnamed has numbers that put you several miles on shore! for one site. not one of his numbers are any good or close!
A local dive boat operator Unnamed sells a worthless book at a once a year scuba show and I was laughed at years back for purchasing his useless book by other divers,I fixed him BIG TIME!
Dive clubs like ours publish some no#s but not all,,,
The State may have a site Wisconsin dose.
Nautical charts may have some on but will only get you close,,
its work,find them and then log them!
One quick tip used by us with out fancy side scan units is to set your sonar only to look at the bottom and loose the water column between,this is done by going into functions and just zooming in the bottom,this way you will see just the bottom in zoom and may catch hard to see low profile structures out of soft materials like wood,,
dive safe,,