Stationary data may be collected while anchored or drifting. Towed bodies may need stabilizing to ensure that the transducer face is parallel with the surface. Stationary data is useful for tracking fish and measuring variability in TS within single fish traces (Warner et al. 2002, Rudstam et al. 2003, Parker Stetter et al. 2006).
Record the beginning and end of all stationary sounding periods on the acoustic log. If the transducer is adjusted, record this as well. Remove stabilizers prior to recommencing the mobile survey.