Waypoints can be in several formats: (Multiple entries are allowed, one per line)
A big thanks to boulter for letting me use his coordinate grabbing code (even though it no longer works).
Here is a handy bookmarklet link that you can drag to your favorites. It is nice because it acts like a regular link if nothing is selected, but if you highlight some coordinates (or anything that bouter's coordinate grabber code can turn into coordinates), it will open up the map right to the coordnates.
I've added this a locationless cache checker page to allow you to check and see if a location has been used for a specific locationless cache. This no longer works either.