Final answer:
The short text messaging feature of the automatic identification system (AIS) allows for messages of up to 158 characters.
Step-by-step explanation:
The short text messaging feature of the automatic identification system (AIS) allows for messages of up to 158 characters. AIS is a system used by ships and vessels to exchange information such as positions, course, and speed. The short text messaging feature is used for communication between vessels and can be used to transmit important safety-related messages.