When it comes to metal detecting, one of the most important accessories that can impact your success is the search coil. The right coil helps you detect deeper, find smaller targets, and cover more ground efficiently. But with so many coil types and sizes available, it can be confusing to choose the right one. This guide will break down the different metal detector search coil types, their uses, and help you decide which coil is best for you.
What is a Metal Detector Search Coil?
A search coil is the part of a metal detector that sends and receives magnetic signals into the ground. It detects buried metal objects by sensing changes in these signals. Different coils produce different magnetic fields, which affects detection depth, sensitivity, and target separation.
Common Types of Search Coils
Concentric Coils
Concentric coils produce a cone-shaped magnetic field. They are great for pinpointing the exact location of a target and work well in areas with low mineralization.
Double-D (DD) Coils
Double-D coils have two D-shaped windings that overlap partially, creating a wedge-shaped magnetic field. This shape provides better ground coverage and enhanced ability to handle mineralized soils. DD coils offer improved target separation compared to concentric coils and are popular for a wide range of detecting tasks.
Mono Coils
Mono coils are single circular coils primarily used in pulse induction detectors. They have deep detection capabilities, especially in highly mineralized or saltwater environments. Mono coils can detect metal objects very well but have limited target separation ability.
Focused Core (DD-FC) Coils
Focused Core coils are a Garrett-exclusive design found on advanced detectors like the Axiom series. These coils concentrate the magnetic field for extreme sensitivity to small gold nuggets while maintaining good depth and ground coverage.
How Size Affects Coil Performance
Coil diameter directly impacts detection depth and ground coverage. Larger coils cover more area and detect deeper, making them ideal for searching large open spaces or for finding bigger targets. Smaller coils provide better sensitivity to small objects and work better in tight areas like parks or heavily littered sites.
Specialized Coils for Specific Needs
- Beach Coils: Waterproof, corrosion-resistant coils designed for saltwater environments.
- Gold Prospecting Coils: Smaller diameter DD or Focused Core coils for detecting tiny gold nuggets.
- Underwater Coils: Fully submersible coils for detecting in lakes, rivers, or shallow ocean.
- Large Area Coils: Extra-large coils like the Garrett Reaper for fast coverage and deep detecting.
Garrett Coil Options and Compatibility
Garrett offers a wide range of coils tailored to their detector models:
- Vortex Series: Waterproof coils with unique connectors specifically for Vortex series detectors.
- Multi-Flex Coils: Designed for the ACE Apex with advanced multi-frequency capabilities.
- ACE Series Coils: Standard and PROformance™ coils compatible with ACE 150–400 detectors.
- AT Series Coils: PROformance™ and Viper coils designed for AT Pro, AT Max, and AT Gold detectors.
- Axiom Series Coils: Featuring Focused Core DD-FC coils and mono coils for extreme gold sensitivity and depth.
- Goldmaster 24k Coils: Specialized coils for the Goldmaster 24k detector, ideal for gold prospectors.
Explore the full selection on Garrett’s Search Coils & Covers page.
Protect and Maintain Your Coils with Covers
Coil covers protect your investment from scratches, bumps, and water damage. Garrett offers durable coil covers in various sizes to fit their coil lineup. Regularly inspecting and replacing your coil cover can extend the life of your detector.
Shop Garrett’s Coil Covers and Accessories.
Choosing the Right Coil for You
When choosing a coil, consider:
- The type of terrain and soil mineralization you’ll be detecting in
- The size and type of targets you want to find
- Your detector compatibility
- Whether you need waterproof or submersible coils
Starting with a standard coil that came with your detector is practical, but adding specialty coils later can enhance your detecting experience.
Frequently Asked Questions
Q: Can I use different coils on my Garrett detector?
A: Yes, but make sure the coil is compatible with your model. Garrett clearly marks coil compatibility on their accessories pages.
Q: Are bigger coils always better?
A: Larger coils cover more ground and detect deeper but are less sensitive to small targets and harder to maneuver in tight spots.
Q: Should I use a DD coil or concentric coil for my area?
A: For highly mineralized or trashy ground, DD coils are preferred. Concentric coils are better for pinpointing and less mineralized soils.
Q: How often should I replace my coil cover?
A: Whenever it shows signs of heavy wear or cracks to ensure your coil remains protected.
Ready to upgrade your metal detecting gear?
Check out Garrett’s latest selection of metal detector coils and tailor your detector to your adventure.
