Figure A2.5 EK80 200 kHz recordings from the Kayak Drone as RV Kristine Bonnevie passes close by during passing 6. A layer of sprat is detected from 3 – 15 m below the surface. The nearest point of approach is marked with a red line in the echogram. The wake of the RV induces heave and roll of the Kayak Drone. Air bubbles from the propeller of RV Kristine Bonnevie emerge below the Kayak Drone a few minutes after passing.