Which of the following is a characteristic of NAVTEX receivers?

NAVTEX receivers are designed to provide maritime safety information, which includes navigational and weather data. One of their key characteristics is the ability to automatically select the correct frequency for receiving broadcasts, allowing them to function effectively without user intervention. This feature is particularly advantageous for mariners, ensuring they receive important information even when navigating through areas with varying signal conditions.

The other options do not accurately describe NAVTEX receivers. For instance, focusing exclusively on weather data is misleading, as NAVTEX also provides navigational warnings and safety information alongside weather updates. While some NAVTEX receivers may be handheld, not all fall into this category; many are also installed as part of a larger navigation system on vessels. Lastly, NAVTEX receivers are not limited to battery power; they can be powered by other means, such as through a vessel's electrical system, allowing for more versatile usage.