When the X-TERRA was initially introduced, I encouraged folks to lower the Sensitivity to about half way when they set the GB, so they didn't overdrive the detector to a point of chatter. Keep in mind that some folks had not detected before, and may not know the difference between the GB tone and chatter. If you are familiar with both, you really don't have to lower the Sensitivity to GB. On rough ground, if you have a 70 or 705, Tracking works best as it not only updates on the fly, the auto mode is able to "fine tune" the mineralization compensation better than we can using our ears in manual mode. On my 705 I run with an auto-ground balance offset toward the positive ground phase. I usually run in open fields with a positive ground balance of 3. This means I build a -3 into the auto GB offset program. In manual mode or on the 70, I lower the proper ground balance number by 3. How much I offset the GB depends on which detector I am using. Since the 70 and 705 have more adjustment settings to work with, you probably wouldn't want to raise or lower the 30, 305, 50 or 505 the full three clicks. But regardless, to offset the GB, properly ground balance your detector, use ALL Metal to make sure you're not over anything metal. Then after you get the proper ground balance, click the minus pad to offset the GB for a positive ground balance. I know that lowering the number may not make sense when you're wanting a more positive ground balance. But on the X-TERRA, lowering the ground balance number makes it hunt with a more positive ground phase and raising the ground balance number makes it hunt with a more negative ground phase. HH Randy
