I took the Cortes to a different place this am and it did not do very well. The fixed ground balance in disc did not agree with the ground I was hunting. The detector chattered like crazy and did not stop until I turned the sensitivity down to 5 and 1/2. I could not find a coin deeper than 4 inches. I checked the ground balance in all metal and it was at least a half a turn off from where I hunted yesterday. I got the Explorer Se out and immediately started finding 8 inch deep wheat pennies. I can live with these slight setbacks if places like this are rare. The difference between where I hunted yesterday and today was like night and day. One final observation. The Corte's meter remained extremely accurate even though I lost considerable depth.