: Standard smartphones do not have the hardware to connect directly to satellites for "ground-penetrating" scans. Magnetometer Limitations : Real metal detector apps use your phone's built-in magnetometer
NASA uses on spacecraft (e.g., MAVEN at Mars) to measure planetary magnetic fields. For Earth, NASA collaborates with USGS for airborne geophysical surveys (helicopters/planes towing magnetic sensors). These surveys map large-scale ore deposits, not individual treasures. The resolution is measured in kilometers, not centimeters. : Standard smartphones do not have the hardware