What term refers to the act of delivering the towline from the towing ship to the ship to be towed?

The term that refers to the act of delivering the towline from the towing ship to the ship to be towed is indeed passing the rig. This terminology is commonly used in maritime operations to describe the process of passing the towing line in a secure and efficient manner to ensure that the tow can be made safely.

Passing the rig typically involves careful coordination between the two vessels to manage the towline properly, avoiding entanglements and ensuring that the receiving vessel is ready to accept the line. This process is crucial in towing operations, as a securely attached towline is essential for safe navigation.

In contrast, other terms in the options refer to different actions: 'pushing the line' does not accurately describe the process of transferring a towline; 'swapping the tow' generally refers to changing which vessel is being towed rather than the delivery of the towline itself; 'hoisting the line' suggests lifting the line rather than passing it between two ships. Understanding these distinctions is key for effective towing operations and enhances overall maritime safety.