Gonzo,
The S1 probe is something that all Sovereigns should have in my opinion. This is a Sun Ray pinpointing probe to help you find the target. What it is actually is a 1 inch coil I tell many that has a switch box that will switch the signal from the main coil to this coil (probe). You use the main coil to find the target and pinpoint the best you can, the switch the toggle switch to the probe and use it to find your target. If it is a surface to 3 inches the S1 probe will find it without digging a plug, but if it is deeper than you will have to dig a plug and then use the probe to find your target. Where this really comes in nice is some of those targets on edge that can and will throw off the pinpointing you spend a long time trying to find without the S1 probe. First you dig some dirt out of the hole, then pick up the detector to see if it is still in the hole, you dig deeper and you may still get the signal so you dig deeper and still no target, so now you make the hole bigger and still you cant find it, but still get a signal, so you dig it bigger yet and have a hole bigger than the coil and deep and no target. Sometimes you may even lose the signal and give up and leave a very nice find in the ground for the next person to find. Now if you would have had the S1 probe and dug a plug and used the probe you would have seen it was over to one side of the hole dug it and back detecting.
I know this S1 probe has found more coins i would have left, found them faster so I could find more and helped with so many iffy signals that were very deep coins I would have lost the signal when I dug the first plug and dirt out of the hole.
The S1 probe is well worth what it cost for what it does. I would be lost without my S1 probe on my Sovereigns.
Rick