Model 980 Advanced Low-Frequency Towed Sonar (ALOFTS)

The Advanced Low-Frequency Towed Sonar (ALOFTS) is a combined active/passive sonar system in service with the Singaporean navy. It provides "under-the-layer" submarine detection and features long-range detection with observed first and second convergence zone detection capability. The ability to place the sonar below the thermal layer prevents submarines from taking advantage of the layer to close without being detected. According to some sources, the long range of the sonar may...