Search Settings?

What do all the check boxes (Postal Code/Address, Cache Code, Current Location, Coordinate, Cache Name, Cache Owner, Username (found), Others) do? For example, I have Cache Code, Cache Owner and Others checked, but can't see what it is supposed to do.

I think if you dont want to see your own caches so you can mark these panels.
If you search by Postal Code and you have marked this panel your own caches won't be in the List.

OK, Now I get it.
If you have the "Exclude your owned or found items from result" box checked, then it will exclude the individual items in the list that are checked as well. If you don't check one of these items, e.g. Postal Code/Address" then it will still show your owned/found items for the Postal Code but still exclude them from other selections that are checked.