The correct answer is B) warnings are printed out for reading when convenient. The NAVTEX system is a specialized maritime radio broadcast system that automatically prints out safety information and navigational warnings on a paper slip or digital display. This allows the user to read the information at their convenience, rather than having to monitor radio broadcasts at specific scheduled times. This is a major advantage over other maritime information systems that require the user to actively listen to broadcasts. The other answer choices are incorrect because: A) NAVTEX does not have scheduled broadcast times, C) NAVTEX uses dedicated receivers, not FM radio, and D) NAVTEX uses medium frequency bands, not low frequency, for its transmissions.