You are on a vessel using AIS code 57 for...

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Question 1 of 20673956e598d45f16831b6e50

You are on a vessel using AIS code 57 for towing ahead. Your vessel’s length overall is 200ft (61m) and the breadth is 54ft (16.5m). The barge is 210ft (64m) with a breadth of 59ft (18m). The GPS antenna is on the centerline centered fore and aft. What GPS antenna position dimension (ABCD) should you enter directly into your AIS?

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Question 1 of 20

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🔍 Key Concepts

• AIS antenna position dimensions (A, B, C, D) relative to the GPS antenna location • Difference between vessel’s own dimensions and tow length when using AIS towing codes (like 57) • Effect of the antenna being on the centerline and centered fore and aft

💭 Think About

• How are A, B, C, and D defined in the AIS standard? (Think: bow, stern, port, starboard distances from the GPS antenna, not from the tow.) • Since the GPS antenna is exactly centered fore and aft and on the centerline, what does that tell you about the forward vs aft distances, and port vs starboard distances? • Which answer choices are in feet and which are in meters, and which unit system matches the way AIS wants these values entered for your setup?

✅ Before You Answer

• Confirm that A + B equals the vessel’s length overall, not including the barge when using this AIS code for antenna position. • Confirm that C + D equals the vessel’s breadth (beam) at the antenna’s location. • Verify that your final choice uses the correct unit (feet vs meters) and matches the vessel’s given dimensions and centered antenna position.

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