The Simple Propagation Estimator And Ranking (SPEAR) model is based on Subacoustech’s substantial database of noise measurements from various sources. It can be used to provide a rank-ordering indication of the typical levels of underwater noise generated by construction related activities.

The SPEAR model uses a simple Source Level and Transmission Loss (SL-TL) model for calculating impact ranges and the area of sea excluded by the particular noise source. Results can easily be compared to determine the significance of the predicted impact as either the effect of multiple noise sources on one species, or as the effect of one type of noise source against multiple species with varying hearing abilities. The SPEAR model is intended for rank ordering a number of activities that cause underwater noise in order of significance, so that critical activities can be identified and selected or evaluated.