How do you signal that you agree to let it pass on your port left side?

To signal that you agree to let another vessel pass on your port (left) side, you should indicate your intention by using the appropriate sound signals, such as one short blast on your horn. Additionally, you can visually signal by steering to the right, ensuring your course allows them to pass safely. It's important to maintain a steady course and speed to communicate your agreement clearly. Always keep a lookout for any further signals or maneuvers from the other vessel.