Towing & Ship-Assist · Ship-Assist & Escort
The abbreviation 'ASD' applied to a modern tug refers to:
- AAutomatic Steering Device
- BAnchor Stowage Davit
- CAzimuth Stern Drive (steerable propulsion units aft)✓ Correct
- DApproved Safety Document
Explanation
An Azimuth Stern Drive (ASD) tug has steerable, 360°-rotating drive units mounted aft. Like tractor tugs, ASDs can apply thrust in any direction, making them highly effective for ship docking and escort.
Authority: Bowditch (Pub. No. 9)
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