I would like to start a sticky for the Sovereign and Excalibur coils in the near future.My idea start with early and progress to the most recent coils and let actual users chime in on their opinions.The right coil will make a difference of success or failure on a search. LOL the other day I had a 14x9 Nugget Finder coil for a GPX and noticed the connector plug was identical to the Explorer.One of my most brilliant ideas, plug the coil into my Explorer and see what happens,there was another thought just don't do it.Anyway my curiosity won out.I plugged the coil in and the Explorer screen went blank,removed the coil and the Explorer was dead would not power back up.Anyway just because a coil connector plug will fit your Sovereign doesn't mean it will work.However the story did end on a good note the Explorer was revived after a little CPR and soldering.Thanks Ron