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Sigma-Tek Heading Ref Series Directional Gyro 4000HR-3. The 4000HR-3 air-driven directional gyro 1U262-010-41 has the functionality and reliability of the industry standard 4000B, and a heading reference bug from the 4000C autopilot model. Pilots find the heading reminder a valuable feature whenever the cockpit is busy during heavy ATC traffic.