When returning to the open sea you see a red buoy how should you respond?

When returning to the open sea and encountering a red buoy, you should treat it as a navigational marker indicating the port side of a channel when entering from the sea. This means you should keep the buoy on your left side as you navigate away from shore. In general, remember that red buoys mark the way in for vessels, so maintain a safe distance and be aware of any associated navigation rules.