Garrett Metal Detectors Metal Detectors GTAx 550 - Manual (Page 17)

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increase depth and sensitivity; press (-) to decrease.
A single touch and release adjusts the level in a
small increment. A continuous pressing results in
a continuous adjustment. When you have made
your adjustment, press Depth again to reenter your
previous operating mode.
Although maximum depth is usually desired, any
detector's circuitry may be limited by the type of soils
over which you are scanning, electromagnetic or
power line interference, etc. Such considerations as
ground mineralization will also inhibit the detector's
ability to interpret target information. This Depth
(Sensitivity) control option permits you to regulate
sensitivity. This will result in achieving the maximum
detection depth possible in relation to any existing
condition.
Garrett engineers designed your GTAx 550 for
maximum detection depth power, but you may not
always be able to operate at a depth setting of 100%;
the same way you wouldn't operate your automobile
at 100% of its speed. Outside electromagnetic