Figure 12. Pressure signal (blue) and distance from hydrophone (green) for the level 2 signal data for the calculations resulting in the plot in figure 5. As can be seen, at time around 52-57 min from start, there is a clear peak at a time when the source vessel is at the furthest distance. The level from the source should hence be similar as for time around 100 min after start, hence when the ship was at the same position during the second round around the race track. Therefore, the peak seen here are not from the sparker source, but rather likely from a boat passing close to the hydrophone.
