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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