Jason in Enid link=topic=6900.msg82103#msg82103 date=1315837700 said:
The E-trac can let you if you have a surface target several ways. First, you don't get a smooth response, you get a double or triple beep. Second, when you pinpoint, you get a very small, very hard BEEP. Deeper targets have a little ramp up into the center zone.
Thinking of it in reverse can help you identify large, deep objects. If your depth meter says it's at or almost on the surface, but you aren't getting those tell-tale signs then you probably have very large, yet deep target.