While underway vessels equipped with an...

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Question 1 of 2066636ee928f7522a1c51a507

While underway vessels equipped with an automatic identification system (AIS) are required to transmit specific information at varying intervals. What information contained in a class A unit broadcast is only required to be transmitted every six minutes?

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🔍 Key Concepts

• AIS Class A static vs. dynamic data per 46 CFR and IMO AIS guidelines • How often dynamic information (like position, course, speed) is refreshed vs. static information (like ship identity and dimensions) • Which AIS fields change constantly while underway and which stay the same for long periods

💭 Think About

• Look at each choice and ask yourself: does this value normally change from moment to moment while a vessel is underway, or does it stay the same for a long time? • Which type of information would need to be updated very frequently to avoid becoming unsafe or misleading to other vessels? • Which item in the list is part of the vessel’s basic identity details, rather than its current movement or condition?

✅ Before You Answer

• Identify which options are dynamic voyage data (e.g., changing with ship motion) and which is static/identity data. • Recall that AIS updates dynamic data (position, COG, SOG, heading, ROT) much more frequently than every six minutes. • Confirm from your study materials which AIS field is classified as static data and is typically sent on a longer (about 6‑minute) interval.

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