The anthropogenic sound sources discussed above are summarized by source level and other parameters in
Table 3, ordered by their relative potential for large-scale exposure of marine mammals to high-intensity
sound. For high intensity sources which are constructed from arrays of elements (e.g. high intensity sonars
and airguns) which can be widely distributed, the 1 m source range is a device for calculation, but in
practice the actual source levels experienced near the source never reach the stated levels. Instead, these
levels are used to give an accurate way to calculate what the source will be at greater ranges, where the
distance to the source is much greater than the source dimensions.