The EIVA Accurate Time Tagging Unit (ATTU) improves the time accuracy during the survey operation by merging data time-tagged by the sensor (GPS, USBL, MBE, etc.) with other sensor data (gyro, motion sensor, depth sensor) where time-tagging has to be performed by the acquisition software.

The ATTU can be applied in any survey set-up that includes EIVA NaviPac and NaviScan navigation and data acquisition software solutions.