SKIPPER DL850 DOPPLER SPEED LOG OPERATOR UNIT: The Skipper DL850 Doppler Speed Log Operator Unit serves as the control interface for the Doppler speed log system. It allows users to interact with and monitor the system’s output, including vessel speed and other critical data. The unit provides real-time feedback, which is essential for navigation and safe vessel operation. Proper maintenance and calibration are needed to ensure the unit’s effective functionality.