A Brief Analysis of the Marine Azimuth Control Lever

Controlled Object: 360° azimuth thruster (podded propulsor or Z-drive). The vessel is rudderless and maneuvers solely by altering the direction of thrust.

1. Core Operation
1）Fore-and-aft movement → Controls thrust magnitude and ahead/astern direction.
2）Rotational movement → Controls the thruster’s azimuth angle (thrust direction).
The handle motion directly corresponds to the underwater thrust vector.
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2. Common Configurations
1）Independent dual levers: One lever per azimuth thruster, typical on tugs. Complex maneuvers are achieved through coordinated two-handed operation.
2）Integrated joystick / controller: A single lever or 3D joystick, with thrust automatically allocated by the dynamic positioning (DP) system. This is commonly found on DP vessels.
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3. Typical Maneuvering Techniques (Using a twin-lever azimuth tug as example)
1）Turning on the spot: One lever set ahead, the other astern, combined with steering angle.
2）Crabbing / transverse thrust: Both levers set to the same lateral direction.
3）Emergency crash stop: At full speed, both levers pulled rapidly to full astern with appropriate azimuthing.
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4. Key Points of Attention
1）Before starting, ensure the lever is in the neutral position (zero thrust, zero angle).
2）Operate smoothly to avoid shock loading or parting of towlines/mooring lines.
3）Distinguish between follow-up and non-follow-up (jog) modes; for fine positioning, use the non-follow-up (jog) control.