Abstract: A combination of integrated circuit (IC) flatpacs used in combination to tch selected sonar microphone inputs from a circular receiving array to position a beam containing a sounding target intermediate to an equal number of left and right microphone pickups and selectively switching through weighted delay circuits for beam forming to present the target in this receiving beam electronically on a flat display with digital control of "coarse" seven and one-half degrees and "fine" one-tenth degree increments to provide a display of the bearing of the target.

Abstract: Apparatus is provided for simulating an ocean environment for sonobuoys wh are being tested in a relatively calm body of water. A floating platform is towed through water to simulate a sea current, and a sonobuoy being tested is attached by a cable to the floating platform. A drum, driven by a reversible motor, winds and unwinds the cable to simulate wave action while the floating platform is being towed.