What equipment is used to obtain In situ SVP measurements?

The correct equipment used to obtain in situ sound velocity profile (SVP) measurements is a sound velocity profiler or SVP Meter. This device is specifically designed to measure the speed of sound in water at various depths, which is essential for various underwater applications such as sonar operation, filming, and oceanographic studies. The SVP Meter typically uses sensors to perform accurate calculations of sound velocity based on temperature, salinity, and pressure.

While the other equipment mentioned plays roles in marine measurements, they do not function specifically to measure sound velocity profiles. For instance, a BSP (Buoyancy-driven Submersible Platform) provides structural support and may carry instruments but is not intrinsically designed for measuring sound speed. Acoustic Dopplers are primarily used to measure water current velocities rather than sound speeds, and hydrophones are microphones designed to detect sound underwater but do not measure the speed of sound itself. Thus, the SVP Meter stands out as the right tool for obtaining in situ SVP measurements.