An operation monitoring system for a machine is provided. The operation monitoring system includes a frame and a dump body. The operation monitoring system further includes an inertial measurement unit to measure acceleration and rotation of the dump body. The operation monitoring system further includes a position determination unit to determine position of the machine. The operation monitoring system further includes a time logging unit to record a time entry. The operation monitoring system further includes a processing unit in communication with the inertial measurement unit, the position determination unit and the time logging unit. The processing unit is configured to determine operation states of the machine based on the received signals.