You see a red lighted buoy with the number 6 what should you do?

If you see a red lighted buoy with the number 6, it indicates that you are approaching a navigational marker, typically used to mark the edge of a channel or hazards. In general, you should keep the buoy on your port (left) side when navigating, as red buoys usually indicate the left side of the channel when entering from the sea. Always exercise caution and ensure you are aware of local navigation rules and conditions.