seriousdetecting.comAnswer
May 21, 2026 - 10:42 AM
The 9-inch FMF coil handles saltwater beach hunting with the same 20-meter waterproof rating and multi-frequency ground-balancing capability as the larger FMF coils. The smaller footprint gives tighter target separation in trashy wet-sand zones where bottle caps and foil cluster near the towel line, and the lighter weight reduces arm fatigue during long surf-wading sessions. The 11-inch and 13 x 11-inch coils cover more ground per sweep on open beach transects, but the 9-inch excels in crowded swim areas and around jetty rocks where maneuverability matters. All three coils run the same frequency range and multi-frequency programs, so the choice depends on site density and swing endurance rather than detection capability.
