White’s Electronics GMZ - Manual (Page 3)

The GMZ is designed for fast and easy setup and operation.
The following procedure illustrates the use of the controls.
1. Check that the battery pack is in position and the door is firmly latched.
2. Set the Ground toggle switch to the Normal position.
3. Turn the Ground Reject knob fully counter clockwise to the lowest setting.
4. Turn the Sensitivity/ Power knob on & set it to the factory suggested preset mark.
5. Sweep the search coil across the surface of the ground and listen for any sound level variations
produced by changing mineralization levels from spot to spot. This will be evidenced by chatter or a
sort of clicking sound.
6. Now adjust the Ground Reject knob clockwise while sweeping or pumping the search coil over the
ground until the chatter diminishes or goes away.
7. You might now place a small target, such as a small gold nugget or lead split shot on the ground and
pass the search coil over it in order to note the sound of a target signal. The coil must be kept in
motion while passing over the target. You may criss-cross your coil over the target to mark the spot
where the target is. The Xing of the signal is the typical way to pinpoint the target.
8. You will note that the GMZ does not produce a threshold hum which is typical of other gold
detectors, but instead operates in silence. The only sounds you might hear are targets, as
demonstrated above, or chatter from extreme ground variations. Continuous ground noises are an
indication that the Ground Reject knob should be corrected further clockwise. Never correct the
Ground Reject further than is necessary to control ground interference.
9. You may use the Ground toggle set at Salt when prospecting in alkaline areas often found on the
desert. Particularly when wet, these areas produce a great deal of interference and make it difficult
or impossible to detect. You can reduce this interference by using the salt position. With the Ground
Reject knob set fully counter clockwise, turn the knob clockwise (to the right) until the noise is
diminished. Never correct the Ground Reject further than necessary.
10. As with any metal detector, the Sensitivity control is used to increase depth of detection. However,
when there is interference from environment or ground it is always advised to reduce the Sensitivity
to allow for interference free detecting.
Happy Hunting……… Dan Geyer and Jimmy Sierra
GMZ Operating Instructions