All the suggestions in the table below are not set into stone and may vary from site to site. They are also dependent on coil size, soil type etc. Use them as a guide to making your own settings for your particular area. I prefer to run lower gains/motions for a quieter detector and listen for any repeatable signal however small, as opposed to higher settings and a lower SN (signal/noise) ratio. If you believe your settings give you an advantage then by all means, use them.   I generally set up GPX 5000 around the settings in the table below with some tweaking as required. As with my older GPX 4500, I have set up Deep mode to look for deeper gold or to run over a patch usually with a larger coil, General mode as a day to day detecting mode, and Patch mode as an EMI blocker for noisy days. I find that the GPX 5000 is far less susceptible to EMI and that I usually can run higher settings than I could previously with the older models.  I try to run in Deep Mode from the above whenever possible, and this I find is usually achievable with the GPX 5000, but if the detector becomes unstable I will switch to General mode, or to Patch mode as required. This means I don't have to access the menu every time I want to make an adjustment, but I still have the option of accessing the menu for minor adjustments though depending on what I am trying to achieve. The manual tune position is where I leave the menu set at as this allows me to make a quick adjustment without even having to look at the menu screen. I usually try to run in the 90 to 100 range of numbers, but if the threshold gets fluttery from EMI a turn of two clicks of the adjustment knob usually settles things down quickly and easily.   As with the previous GPX Models, controlling interference (EMI) is a balance of the Gain, Motion, Audio and Stabiliser settings. The gain level you choose is dependent on coil size and EMI levels for a particular day.   The Motion filter is used to combat EMI or to match your coil swing speed to the target. A very slow motion speed controls EMI the best, but broadens the response from a target. The motion speed has a bearing on just how short and sharp the response from the target is. Higher motion speeds "quicken" the response, so I try and run the highest motion speed that conditions allow, but for our area this usually means slow at best.   The Audio setting for me on a GPX 4500 usually sat at normal, but I find the GPX 5000 allows me to use Deep audio (not the same as Deep Mode) more often. Deep audio boosts the signal response. Boost audio is excellent for small coils and the 11" mono coil coupled with Boost audio and Fine Gold setting is a deadly combination on the little bits. Quiet audio is excellent for days that the spikes and EMI are an issue. The gain and stabiliser settings can be elevate to quite high levels when this audio setting is utilised.   I generally run the Stabiliser setting at between 8 and 10. Low levels may cause some targets to be missed entirely if the coil isn't able to be centred over the target. The Stabiliser controls the point at which small variations in the threshold are able to be heard, therefore a low setting will lose those fainter signals. The target volume control in the lower menu (as opposed to volume limit towards the top which clips extremely loud sounds) is a personal thing, but 8 to 10 for headphones and 10 to 12 for speakers are general settings. Personal preference and hearing ability will affect these results. On windy days you might run this up to 15. All the above was for the lower section of the menu. The upper section consisting of Volume limit, backlight, and down to Manual tune with the exception of the “Special” timings is rarely changed, and the factory pre-sets are fine. If these settings have been changed then simply restore the factory presets , and then adjust the lower portion as above. The switches on the front panel are constantly used. The mode switch is easiest to think of as being 3 different detectors. The settings in the table are for each mode as applicable, being Deep, General and Custom (factory called Patch in the menu). These settings can be altered to make the detector do different tasks or look for different sized targets. The soil switch sets the detector timing. Normal is the same as all previous models and is best for quieter ground types. The “Special” setting is determined by what selection is made in the menu. There are several choices, of which “Fine Gold” is the factory pre-set. Fine Gold is good for areas that are slightly warm as it diminishes the smaller ground noises and hot rocks. Enhance is the other selection. This timing eliminates most all ground noise and hot rocks except for the extreme ones. The targets are diminished in volume because as the timing removes the ground noise, it also removes some of the target response. ANY signal that is consistent in both directions needs to be investigated as a possible metal target. If we run in Enhance we usually use a larger mono coil and Fixed ground balance. The Coil RX switch has several functions as the manual states and more information is found in there. I find that mono coils run slightly more quietly in mono mode than DD. The Tracking switch controls whether we are manually ground balancing in Fixed,  or the detector is doing it for us in Tracking.
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