The beach looks like one big stretch of sand. It's not. Once you learn to read it, you'll stop randomly swinging and start hunting with intention.
Every beach has the same five zones. Most beginners hunt one of them their whole first season without knowing the other four exist. Here's what you're actually walking past.
1. Dune Line
2. Dry Sand / Towel Line
3. Berm / Flip Zone
4. Wet Sand
5. Waterline / Surf Zone
Random swinging is how you walk a lot and find little. These four patterns cover different situations — use the right one for the right zone.
Zig-Zag (Find the Coin Line)
Walk diagonal across the beach — toward the water at an angle, then back up toward dry sand — in a long zig-zag. You're crossing multiple zones in a short distance. When you start hitting targets consistently at one depth/zone, stop zig-zagging and switch to grid.
Best for: first pass on a new beach. Helps you locate which zone is currently holding targets.
Grid (Work a Hot Spot)
Once you find a productive zone — say, a stretch of wet sand that's been giving you coins — set up a methodical grid. Walk your rows parallel to the water with enough overlap that your coil passes cover every inch. Mark your start and end mentally so you don't re-hunt the same ground.
Best for: concentrations of targets, structure zones (near lifeguard towers, stairways), post-storm cuts.
Spiral Out From a Find
When you dig something good, don't move on immediately. Items tend to cluster. Slowly spiral outward from the find spot in circles of increasing radius. A lot of detectorists leave a pile of targets behind because they got excited and walked away.
Best for: after digging a ring, gold, or older coin. Jewelry clusters near where people sit repeatedly.
Slow Overlapping Sweeps
Keep your coil 1–2 inches off the ground (not 4–6 — that's signal loss). Sweep slow enough that the coil is moving about one foot per second. Overlap each pass by about one-third of your coil diameter. Speed kills depth — the faster you swing, the shallower your effective detection.
Best for: all the time, everywhere. This is just good technique. Develop it early and it becomes automatic.
Most people pack up their gear when a storm rolls through. You should be planning your next morning hunt.
When wave action and storm surge attack the face of a beach, they erode the sand that's been building up over weeks and months. Objects that have been buried — sometimes for years — suddenly appear inches below the surface. The productive window is 24 to 48 hours after the storm, before new sand fills in the cuts.
Metal detecting is partly archaeology, partly human psychology. Think about where people congregate, then go there the next morning.
Beach conditions are the most challenging environment for a metal detector. Salt water is conductive and throws off ground balance. Here's what matters.
Ground Balance
This is the big one on the beach. Wet salt sand reads as a target to your detector if ground balance isn't set correctly — you'll get endless false signals. Either use auto ground balance (tracking mode), which adjusts continuously, or manually pump your coil over wet sand to balance before you start. Re-balance when you move from dry to wet zones.
Sensitivity in Black Sand
Black sand (heavy minerals, magnetite) saturates your signal and causes chatter. If you're getting constant falsing in a mineralised area, dial sensitivity down until the machine quiets. Yes, you lose some depth — but a noisy machine is useless. Find the threshold where it runs stable and accept that depth trade-off.
All-Metal vs Discrimination Mode
All-metal mode detects everything. Discrimination mode filters out certain conductivity ranges (typically iron/foil). On the beach, all-metal at the waterline gives you maximum depth for gold. In the dry sand zone, some discrimination helps reduce pull tabs and foil. Learn both modes — conditions determine which to use.
VDI Numbers — What They Actually Mean
VDI (Visual Discrimination Indicator) is a number that represents the electrical conductivity of the target. Low numbers (1–20): iron, foil, small gold. Mid numbers (20–60): pull tabs, nickels, some gold rings (gold varies a lot by karat and size). High numbers (60–95): silver coins, copper, aluminum cans. A thin gold ring can read in the teens. Never skip a low signal near the waterline.
Coil Height
Keep the coil as close to the sand as possible without dragging — 1 to 2 inches max. Every inch you raise the coil costs you signal depth. Most beginners swing too high because the coil keeps hitting the ground. Slow down and keep it low.
Metal detecting exists in public spaces. The hobby's reputation depends on how its members behave. These aren't suggestions.