Question 729Navigation General

The correct answer is D) 158 characters. The automatic identification system (AIS) on ships allows for a short text messaging feature that can transmit up to 158 characters. This is the maximum character limit set by the International Telecommunication Union (ITU) and the International Maritime Organization (IMO) for the AIS messaging functionality. The other answer choices are incorrect because 56 characters (option A) is too low, 64 characters (option B) is the maximum for certain other maritime messaging systems but not for AIS, and 128 characters (option C) is also lower than the actual 158-character limit for AIS short text messages.