Some answers
Treasure Vision is a graphic display that simultaneously shows the depth & size of a target while using the imaging coil. Ground tracking is when the detector adjusts to compensate for changing ground conditions. This allows the detector to get the maximum possible depth/sensitivity. The GTI detectors have ground tracking with the 2500 allowing for manual adjustment. Treasure vision is helpful and helps a lot when "cherry picking" or just plain digging 'cause it reduces the guesswork. Ground tracking is not absolutely necessary, just really, really nice to have. ..Willy.