Features: The Shallow Water Intermediate Search System (SWISS) is a dual-frequency towed side-scan sonar system mounted inside a torpedo shaped tow body. The sonar is towed behind a vessel at slow speeds, generally from one to five knots. Sonar signals are processed producing both an analog and digital display of features on the ocean bottom. Trained operators interpret these displays to identify potential targets. The low frequency is generally used for primary searching and the higher frequency can give an extremely fine grain trace of bottom features and contacts. This allows for detailed analysis of the contacts.