Which of the following devices is primarily used to receive NAVTEX transmissions?

The device primarily used to receive NAVTEX transmissions is a NAVTEX receiver. This specialized equipment is designed specifically for picking up NAVTEX signals, which convey maritime safety information such as navigational warnings, meteorological forecasts, and other important updates for vessels. NAVTEX operates on specific frequencies and protocols that these receivers are tailored to decode, ensuring that the information is accurately received and displayed for mariners.

While HF radios can potentially receive NAVTEX transmissions, they are not specifically optimized for this purpose and may require additional configuration. Satellite phones serve a different function, mainly for voice communication and data transfer, rather than for receiving navigational broadcasts. Marine VHF radios, though essential for communication at sea, are also not equipped to handle NAVTEX signals, as they operate on different frequencies and protocols meant for vessel-to-vessel or vessel-to-shore communication.

Therefore, the NAVTEX receiver stands out as the correct choice due to its dedicated design for receiving specific NAVTEX broadcasts.