Final answer:
A vessel servicing a pipeline during the day should display horizontal cylinder shape, diamond with yellow background shape, and all-round yellow light.
Step-by-step explanation:
During the day, a vessel servicing a pipeline should display shapes that are commonly recognized as navigation signals. These shapes include:
- Horizontal Cylinder: This shape denotes a pipeline or a vessel involved in pipeline operations.
- Diamond with Yellow Background: This shape indicates that the vessel is restricted in its ability to maneuver due to its operations.
- All-Round Yellow Light: This light is used to indicate that a vessel is engaged in pipeline operations.
Displaying these shapes helps other maritime traffic to identify and navigate safely around the vessel servicing the pipeline.