Does UGPS G2 still work when there is significant acoustic interference?

The positioning algorithms of UGPS G2 are designed to be very robust, and the system will continue to work in environments when most other systems would not.

Interferences with line of sight between the locator and the antenna/receivers, such as shoals of fish or hard objects on a harbour side/shoreline will likely decrease somewhat the range at which the system can operate. 

Highly reflective environments, such as tanks, are very challenging acoustically, and will likely lead to some deterioriation in performance, such as decreased stability of the position.

Overall though, UGPS G2 should perform well in the vast majority of conditions.