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You are approaching a powerboat head-on
You are approaching a powerboat head-on
You are approaching a sailing vessel - head-on
You are approaching a powerboat head-on
You are approaching the starboard side of another vessel
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.
You are approaching the port side of another vessel
It depends on the configuration seen. There are different lights visible depending on the relative headings of the vessels and relative sizes etc.
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.
In not knowing the configuration of the lights you are looking at, it is hard to answer. If the red light is lower on the vessel around the bridge, you maybe seeing the vessels port side (left) running light. The white light is going to be either a masthead light or possibly a stern light. However if the red light is much higher, atop the mast, then this could indicate more than a few different scenarios. Lights & Shapes Rule 21-International Definitions (b) "Sidelights" means a green light on the starboard side (right) and a red light on the port side (left) each showing an unbroken light from right ahead (000 degrees) to 22.5 degrees abaft of the beam on its respective side. In a vessel of less than 20 meters the sidelights maybe combined in one lantern carried fore and aft of the centerline.
On power-driven vessels, navigation lights must be on during periods of restricted visibility.
On power-driven vessels, navigation lights must be on during periods of restricted visibility.