How to Use Garrett ACE 400?

The Garrett ACE 400 is one of the most highly rated metal detectors for enthusiasts. It offers great performance for such a reasonable price. If you’ve just purchased one, its features may look complicated and confusing. Don’t be alarmed, operating this detector is more straightforward than it may appear at first. This guide aims to assist you in setting up, configuring, and using the ACE 400 in real-life. Possible detecting targets include coins, jewelry, and relics. Adjusting your detector and swinging it correctly makes all the difference. This guide is designed to help you become a confident detectorist.

Garrett ACE 400 Specifications & Key Features

The Garrett ace 400 is very versatile. It runs on a frequency of 10 kHz, which is able to find smaller objects while also having a great depth range to find larger objects. It has a Digital Target ID ranging from 0 to 99, which provides a range for the type of metal before you dig. It comes with an 8.5” x 11” DD coil, which provides a good depth range, and is able to find multiple targets in trashy areas. It also has an Iron Audio feature which allows you to hear the discrimination and then makes you silence it. This is a good feature for summarizing sites where valuable items are near iron debris.

Technical Specifications

Here’s a quick overview of the core specifications:

• Operating Frequency: 10 kHz

• Target ID Scale: 0–99

• Search Coil: 8.5” x 11” DD Performance coil

• Iron Audio: Yes

• Adjustable Sensitivity: 8 levels

• Power Source: 4 AA batteries

• Headphone Jack: 1/4 inch

From these specifications, you will be able to attain solid depth, stable identification, and will have a versatile experience in different environments. The tuning coil helps to enhance the coverage and gives it the ability to handle the mineralized soils better than the standard concentric coil. The adjustable frequency also helps you to get rid of the electrical imbalances, which is great when detecting near powered lines

Unboxing & Assembly Instructions

When you set up your detector properly, you can expect a smooth and easy setup every time after. When you open the box, you’ll see all the pieces you need, such as the control housing, the top and bottom shafts, the search coil, hardware, and batteries. Assembly takes just a couple of minutes, and you won’t have to use any extra tools. First, use the provided bolt to attach the coil to the lower shaft and tighten it, but don’t overdo it. Next, wind the coil cable up the shaft but don’t pull it too tight. Finally, connect it to the control box. Put in the batteries, switch it on and then you can go take a test sweep.

Step-by-Step Assembly

Follow these steps carefully:

1. Attach the search coil to the lower shaft.

2. Secure the coil bolt snugly.

3. Wrap the cable evenly up the shaft.

4. Connect the cable to the control housing.

5. Adjust shaft length to your height.

6. Insert 4 AA batteries.

7. Power on and check for stable signals.

If the coil cable is flexible around the base, it will stop the machine from sending fake signals when you are moving around. Making sure your device is correctly set up will minimize the chattering of the machine and it will also help you get the signals you are looking for when you are searching.

Understanding the Control Panel

Recognizing the functions of all the buttons can be very beneficial. The   Power button is for turning the unit on or off. Noise can be a factor, however, the search depth can be set to high, medium, or low. The depth setting all the way up runs the risk of your unit being very noisy due to the higher depth targets. The unit can also be programmable for different things, such as Coins or Custom. Discrimination on the Control Panel is to help you ignore targets you want to ignore. The Digital Target ID helps you identify the material as it falls in a range from 0 to 99. In a trashy area, Iron Audio helps you hear targets. Instead of rejecting the audios from the trash, you can hear the junk audio to help you know.

Target ID Numbers Explained

The Target ID scale helps you decide whether to dig:

These figures and numbers are best estimates and should be treated like a guess in many cases due to soil conditions, the shape of the object and the depth of what your soil consists of. Over time, you’ll start picking out the average/common estimates for items.

Best Garrett ACE 400 Settings for Different Situations

Your Garrett ACE 400 needs to have its settings changed depending on where you search. In parks, you can start with sensitivity at the middle level, and Coin Mode to hear fewer signal interruptions from trash. If you’re looking for jewelry, try sensitivity around the middle and lower the discrimination to be sure you don’t miss small gold. For relic hunting, choose Mixed Mode, and turn on Iron Audio to help judge mixed signal hunting. In very trashy areas, lower the sensitivity, and notch out certain unwanted ranges very trashy. Make gradual adjustments instead of going for bigger changes. Small changes can be more effective than larger changes.

Settings Comparison Table

This approach keeps your detector stable while maximizing useful signals in each environment.

How to Properly Sweep the Coil

How to Sweep the Coil the Right Way   Your technique will have more of an impact on the results than the other settings. Keep the coil flat and close to the ground, but don’t touch the ground. Swing to the left and to the right. Sweep each pass so that you get all of the targets between each pass. Try not to lift the coil at the end of the swing because it will impact detection depth. A steady rhythm will get you the best results. Smooth and controlled will allow for the best signals to be identified. Think of it like mowing the lawn.  

Sweep Technique Tips

To improve consistency:

• Keep the coil parallel to the ground.

• Move slowly and steadily.

• Overlap swings by 30–40%.

• Avoid sudden jerky motions.

• Re-scan promising signals from multiple angles.

Cross-checking a signal from different directions helps confirm whether it’s a solid target or irregular scrap metal. Patience pays off in cleaner recoveries.

How to Pinpoint Targets Accurately

Pinpointing is important as it helps reduce digging and saves time. It is helpful to try this after receiving your fourth signal. Press your pinpoint button and swing your coil to the spot. Listen for the tube’s strongest signal. The tube’s strongest signal is most likely the target’s center. Focus on smaller areas so you can mark the spot with your foot. If you are searching in a grassy spot, try to cut a clean plug, instead of a copious dir.

Cross-Sweep Method

A simple technique to refine location:

1. Sweep left to right over the signal.

2. Note the strongest point.

3. Rotate 90 degrees.

4. Sweep again front to back.

5. Dig at the intersection point.

This method improves accuracy and reduces oversized holes. With practice, you’ll locate targets within a few inches consistently.

Maintenance & Care

With a little bit of care, you can properly maintain your detector for long-term performance. After every trip, give the coil and shaft a wipe down to rid the detector of rub, dirt, and moisture. Please keep the control box dry and do not submerge it in water, as this part is NOT waterproof. Please also remember to remove the batteries the next time you store the unit to avoid leaks. Do your best to keep the unit in a dry, cool, place. Keep the coil cables, as well as the connections, in top condition. Simple tasks, like the ones mentioned above, will keep your performance at the same level as the amount of time you spend on it.  

Storage Checklist

Before storing your detector:

• Clean coil and shaft.

• Dry all components.

• Remove batteries if unused for weeks.

• Loosen coil bolt slightly to reduce pressure.

• Store upright or flat in a safe area.

These small habits extend the life of your equipment and ensure it’s ready for your next adventure.

Conclusion

It will be easier to learn the controls and practice techniques to use the Garrett ACE 400 to start metal detecting. Start with lower sensitivity to get the feel for the motion and take your time getting used to different signals. Each time you go detecting you will gain experience and your judgment will improve. Eventually you will see patterns come and go in the ID’s and tones, even without glancing at the screen. Remaining consistent is the primary factor in the ACE 400’s success. With the right location and adjustments, this metal detector will find valuable items like coins, jewelry and relics. Enjoy the search and take your time!