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Hi Fred, A quick push of the button "grabs" the ground balance. You can't turn the tracking off but remember this is not a classic metal detector and chances are you do not want to turn it off anyway. Tracking out targets is not likely to be an issue so no reason. Ratcheting is the practice of getting near the target, pressing the pinpoint button on a detector to reset signal, and then getting a sharper pinpoint signal. You ratchet the signal down until right on target. This can be done with the TRX but is probably not necessary in most cases. I never park hunt without a pinpointer. It ups my efficiency level ten-fold. You do not need a pinpointer nugget detecting per se but I always have one along with my GPX 5000 and a big coil. I still get tricked on elongated trash targets a lot and find I am digging just off target. The pinpointer has saved me digging to China many times locating a nail in the side of the hole. I also use the pinpointer if I am approaching any large target in the bottom of a deep hole. The pinpointer lets me know I am close and might save putting a pick tip into a very valuable nugget or specimen. Pinpointers are usually of less use on small stuff but the TRX may help in that regard. It may make a neat little crevice tool but jury is out. White's is claiming to beat out the Garrett and Minelab pinpointers though not by name of course. We will see. The photo below is of a 1.26 oz nugget I found with the aid of the Garrett Pro Pointer while using my GPX. I carry the pinpointer in my rucksack that gets stashed nearby while detecting because a pinpointer is scientifically designed to set a large coil off at maximum distance. If I keep it in my back pocket it is ok but just barely.