How to Metal Detect in Water: Tips for Metal Detecting Underwater

Why Metal Detect in Water? The Appeal of Underwater Treasure Hunting

Benefits of Metal Detecting in Water

Metal detecting in water offers a unique range of benefits compared to land detecting. Many people frequent beaches, lakes, and rivers, often losing valuable items like coins, watches, and jewelry in the water.

Because of fewer detectorists searching underwater, the chances of finding valuable items are higher, especially in popular swimming areas. Furthermore, the thrill of finding items in less-disturbed areas and uncovering historical artifacts adds to the appeal of underwater treasure hunting.

Common Finds in Lakes, Rivers, and Oceans

When learning how to metal detect in water, it’s helpful to know what types of items are commonly found. Beaches, lakes, and rivers often yield rings, necklaces, watches, coins, and vintage artifacts.

Items buried underwater are often preserved better than those on land, protected from oxidation and corrosion by sediment and mud. In freshwater areas, for example, it’s not uncommon to find historic coins and relics, while ocean searches may reveal items like shipwreck treasures or exotic jewelry lost by beachgoers.

Success Stories of Underwater Metal Detecting

Some treasure hunters have made significant discoveries in water, from centuries-old shipwreck treasures to rare historical artifacts. In Florida, for instance, divers have recovered gold and silver coins from sunken Spanish galleons.

Even on a smaller scale, many metal detectorists have found valuable jewelry and coins near popular swimming areas. These success stories motivate hobbyists and professionals alike, proving that learning how to metal detect in water can indeed be rewarding.

Essential Equipment for Water Metal Detecting

 

Choosing a Waterproof Metal Detector

One of the most critical investments for underwater treasure hunting is a reliable waterproof metal detector.

Not all metal detectors are designed for water use, so it’s essential to choose a model specifically made for underwater conditions. Waterproof metal detectors are built to resist corrosion, pressure, and water damage, allowing users to detect at different depths.

Popular choices include the Garrett AT Pro, Minelab Excalibur, and Nokta Makro Simplex, all known for their durability and accuracy underwater.

Accessories for Water Detecting (Scoop, Waterproof Bag, etc.)

Along with a waterproof metal detector, specific accessories can make underwater detecting more efficient and enjoyable. A sand scoop or digging tool is crucial for retrieving finds quickly and easily, especially in sandy or rocky areas. A waterproof carrying bag keeps essential items dry, and a floating sifter can be helpful for sorting through debris. Pinpointers, which help locate small items in tight spots, are also useful but should be waterproof if they’re to be used in deeper water.

Wet Suits, Waders, and Other Protective Gear

Protective gear is necessary for comfort and safety when metal detecting in water. For cold or deeper waters, a wetsuit provides insulation and allows greater mobility underwater. Waders are ideal for shallow-water detecting, particularly in lakes and rivers where the water is shallow but cold. In areas with rough terrain or sharp objects, gloves and water shoes protect your hands and feet, making underwater treasure hunting safer and more enjoyable.

Types of Water Metal Detecting: Shallow vs. Deep Water

Detecting in Shallow Waters (Beaches, Shorelines)

Shallow-water detecting is a popular starting point for beginners and involves searching along beaches, shorelines, and shallow lakebeds. It’s easier to detect in these areas without specialized diving equipment, and many lost valuables can be found in the sand and mud along the shore. Shallow-water hunting can be just as rewarding as deep-water detecting, especially in high-traffic beach locations where jewelry and coins are frequently lost.

Techniques for Detecting in Deeper Waters

For those interested in venturing into deeper waters, advanced techniques and equipment are necessary. Deep-water metal detecting typically involves diving or snorkeling and requires knowledge of underwater navigation and metal detecting equipment suited for significant depths. Investing in dive-rated metal detectors and understanding buoyancy control are essential. Scuba gear and weight belts are often used to maintain stability while searching for treasure on the seabed.

Safety Tips for Deep-Water Metal Detecting

Safety is paramount when metal detecting in deeper waters. Checking for hazards, such as sharp rocks, swift currents, and sudden changes in water depth, can prevent accidents. It’s also crucial to monitor weather conditions, avoid detecting alone in deep water, and carry essential safety gear like an underwater flashlight and signaling device. For beginners, partnering with an experienced diver can make deep-water detecting both safer and more enjoyable.

Best Locations to Metal Detect in Water

Lakes and Freshwater Spots

Lakes and other freshwater locations are fantastic for underwater metal detecting, especially those near popular swimming spots, boat ramps, and picnic areas. People often lose valuable items when swimming or launching boats, creating prime hunting grounds for detectorists. Additionally, freshwater lakes with historical significance, such as those used by early settlers, may contain relics and old coins, adding an element of historical discovery to the search.

Ocean and Beach Locations

Oceans and beaches are top choices for many water detectorists due to the high volume of foot traffic and the wide variety of potential finds. Coastal beaches are ideal for finding lost jewelry, coins, and even historical artifacts that wash ashore. The best time for beach detecting is often after a storm, as waves and currents may uncover new treasures buried beneath the sand.

Rivers, Streams, and Hidden Waterways

Rivers and streams are often overlooked but can be very fruitful for metal detecting in water. Historically, rivers were popular trade routes and homesteading sites, meaning they may contain remnants of tools, coins, or other valuables from past generations. Smaller waterways, such as creeks, are also worthwhile, as they accumulate lost items over time and are less likely to have been searched extensively.

How to Use a Metal Detector in Water Effectively

Adjusting Metal Detector Settings for Water

Learning how to adjust your metal detector for underwater use is essential for maximizing your results. Start by lowering the sensitivity setting to reduce interference from saltwater, minerals, and debris. Some detectors have preset modes specifically for water that can help reduce false signals. Additionally, familiarize yourself with ground balancing, as this will make the detector more responsive in different types of underwater terrain.

Finding Optimal Sweep Speed and Angle

When using a metal detector in water, a steady and slower sweep speed tends to yield better results, especially in murky water where visibility is low. The angle of the detector coil is also important; try to keep it parallel to the ground, or in this case, the lakebed, river bottom, or ocean floor. Moving too quickly or at an angle can result in missed signals, so patience and precision are key.

Tips for Reducing Interference in Water

Interference from saltwater, mineralized soil, or surrounding debris can be challenging in water metal detecting. To minimize this, start with areas where the water is calm and avoid locations with high concentrations of metal debris, like near piers. Saltwater detectorists may want to consider pulse induction (PI) detectors, which are better at handling interference in mineral-rich environments.

Techniques to Increase Your Chances of Finding Treasure Underwater

Target Identification in Water

Proper target identification helps you understand what lies beneath before digging. Many advanced metal detectors include target ID features that help you differentiate valuable targets like coins or jewelry from junk metal. In underwater detecting, learning to identify target tones and IDs can save time, helping you focus on promising signals rather than digging up every signal.

Grid and Line Searching Methods

For efficient coverage, try using grid or line searching methods. In grid searching, you cover a specific area systematically, moving in parallel lines to ensure you don’t miss any sections. Line searching is particularly effective in water metal detecting, as it’s easier to keep track of your movements in a straight path. Both methods can help you cover large areas without doubling back or overlooking spots.

Understanding Tides and Water Currents

For beach and ocean detecting, knowledge of tides and currents is essential. Low tide typically exposes more beach area, making it easier to detect items that would otherwise be underwater.

Currents can also play a role in transporting items closer to shore. Studying tide charts and timing your detecting sessions accordingly can improve your chances of finding lost treasures, as more areas become accessible and fresh items may wash up.

Common Challenges of Water Metal Detecting

Visibility and Silt Buildup

One of the biggest challenges in water metal detecting is reduced visibility, especially in areas with mud or silt. When digging in silt-heavy areas, the water can quickly become murky, making it difficult to see your detector and targets. To minimize this, try to disturb the ground as little as possible and allow silt to settle if visibility becomes poor. Wearing goggles or a dive mask can also improve sight under these conditions.

Battery Life and Water Damage Prevention

Battery life can be a limiting factor in underwater metal detecting, as metal detectors and accessories like pinpointers often drain power faster in water due to environmental resistance. Carry extra batteries or a portable charger if possible, and always check your equipment's waterproof seals. Saltwater can be particularly damaging, so rinse your gear thoroughly after each use to prevent corrosion.

Handling Large Finds Underwater

Occasionally, water detectorists encounter large or heavy finds, such as relics, large coins, or jewelry. Lifting and transporting these items in water can be challenging, especially in deeper areas. Using a sifter or a floating retrieval tool can help, allowing you to bring large items to the surface without straining or damaging them. For particularly large finds, a dive bag or net may be useful.

Cleaning and Preserving Underwater Finds

Best Methods for Cleaning Metal Detector Finds

Cleaning underwater finds requires a gentle approach, as saltwater and freshwater exposure can create delicate surfaces on coins, jewelry, and artifacts. A soft toothbrush and warm, soapy water are typically sufficient for most finds. For valuable items, consider consulting a professional for cleaning, especially if the item is historically significant or has intricate designs.

Tools for Preserving Artifacts and Coins

Once cleaned, it’s essential to preserve valuable finds to prevent further degradation. Coin collectors often use acid-free holders, while other artifacts may benefit from gentle drying and sealing in airtight bags. Products like silica gel packs can help control humidity levels, protecting items from corrosion. Remember that some underwater finds may benefit from professional preservation if they are particularly rare or fragile.

Understanding Legal Considerations for Finds

Laws and regulations regarding finds vary by location, especially for items of historical value or artifacts found in public waters. Research local regulations before metal detecting, and consider consulting legal resources if you find something of potential historical significance. Some areas require permits, while others may restrict removing artifacts altogether, so staying informed can help you avoid legal complications.

Tips for Beginners in Water Metal Detecting

Starting with Shallow Waters

For beginners, starting in shallow waters is a good way to get comfortable with underwater detecting techniques without investing in diving equipment. Beaches, lakeshores, and rivers with gentle currents provide an easier introduction to the process and help you learn the basics without the added challenge of deep-water conditions.

Learning from Experienced Detectorists

Joining online forums or local metal detecting groups is a great way to learn from experienced detectorists. Seasoned treasure hunters can offer tips on how to metal detect in water effectively, share their knowledge about ideal spots, and even provide guidance on equipment. Many detectorists are eager to help beginners succeed, making these communities valuable resources.

Joining Underwater Metal Detecting Communities

Being part of a metal detecting community connects you with others who share your interests. Many forums, Facebook groups, and online communities focus on underwater metal detecting, where enthusiasts share their finds, discuss equipment, and organize group hunts. Engaging with a community can provide ongoing support, motivation, and tips for improving your underwater detecting skills.

Conclusion

Is Water Metal Detecting Worth the Effort?

For those passionate about uncovering hidden treasures, water metal detecting is a unique and rewarding experience. Though it presents challenges like visibility and water resistance, it also opens up a world of potential finds, from coins to artifacts and jewelry. By following the right techniques and using quality equipment, underwater treasure hunting can become both an enjoyable and occasionally profitable pursuit.

Final Recommendations for Success

Whether you’re a beginner or an experienced detectorist, water metal detecting can add excitement and adventure to your treasure-hunting journey. Invest in the right tools, take the time to research your spots, and practice patience. With the right approach, your next big find could be waiting just beneath the waves.