The SDAD has three modes of operation: Basic DIRECTION-TO-FAULT, with centering ability Time-based distance to fault, triggered by ballistic impulse (Magnetic thumper wave) to eliminate false tripping due to background noise FAULT DEPTH indication All other features are the same as the D.A.D., which has been proven to be the industry-standard for detection of thumper pulses, and is in use by most leading utilities in the U.S. Protected under *US Patent #4,835,478 and patents pending.