Which Personnel Qualification Standards (PQS) section is termed the 300 series?

The 300 series within the Personnel Qualification Standards (PQS) specifically refers to "Watchstations." This section is focused on the qualifications and training required for personnel to successfully operate and maintain various watchstations in engineering and other critical areas aboard naval vessels. Mastering these watchstations is essential for ensuring safety, operational readiness, and the effective functioning of machinery and systems.

While the other options relate to different aspects of qualifications and training, they do not fall under the 300 series designation. For instance, the fundamental PQS typically covers basic knowledge and skills necessary for all personnel, engineering would encompass broader engineering principles and practices, and technical operations include specialized skill sets relevant to specific functions. Each of these series has its own unique numbering and focus, which is why "Watchstations" is specifically identified within the 300 series.