Which Inmarsat Earth Stations could a vessel utilize for Inmarsat-B traffic if operating off the Pacific Coast of the United States and tracking the POR satellite?

The selection of the Santa Paula Earth Station in the USA, Auckland in New Zealand, or Yamaguchi in Japan for Inmarsat-B traffic when operating off the Pacific Coast of the United States while tracking the POR satellite is correct because all three stations serve the necessary geographical area and are compatible with Inmarsat's services for this specific satellite coverage.

For Inmarsat-B traffic, vessels operating in the Pacific region require access to ground stations that can provide a reliable link to the satellite network. The Santa Paula station in the USA is particularly significant as it is specifically designed to support maritime communications along the Pacific coast. Auckland, being located in New Zealand, offers coverage for vessels operating further out in the Pacific, while Yamaguchi, positioned in Japan, provides additional support and redundancy in coverage for the area.

These stations are strategically placed to ensure that vessels at sea have a dependable connection to the Inmarsat satellite infrastructure as they travel various distances from shore. This operational reliability is critical for safety, communication, and navigation for vessels engaged in maritime activities in this region. Other choices include stations that may not provide the necessary coverage or may be located too far to effectively support Inmarsat-B traffic for vessels in the specified operating area.