When mooring port side to with a wind or current from astern, the approach angle should be what?

Approaching at an angle of approximately 45 degrees when mooring port side to with the wind or current coming from astern is effective because it allows for better control of the vessel as it nears the dock. This angle creates a more manageable interaction with both the wind and current, reducing the forces that push the boat sideways and making it easier to navigate into the dock.

By approaching at this angle, the helmsman can utilize the momentum of the wind or current in a way that assists with the mooring process, allowing the crew to better prepare for fenders and lines when making contact with the dock. Additionally, a 45-degree approach provides more room for adjustment if needed and enhances visibility for the operator, making the maneuver safer and more efficient.

Choosing to approach more straight (as indicated in another option) can lead to losing control of the vessel as it may be harder to counter the external forces at play. A steeper angle, like 90 degrees, could result in difficult and abrupt contact with the dock, making it more challenging to manage the vessel's speed and direction effectively.