What is indicated by a red light over a white light and another white light at a lower side level?

The configuration of a red light over a white light with another white light positioned lower indicates that the vessel is engaged in fishing and is not trawling with gear extending over 150 meters. In accordance with COLREGs, fishing vessels must display specific lights to convey their operational status to other vessels.

In this particular light arrangement, the red light signifies that the vessel is not under command, but since a white light is included below it, this indicates the type of fishing the vessel is engaged in, distinguishing it from trawlers that may have gear extending further than the specified distance. This arrangement assists other vessels in understanding the operational context of the fishing vessel, thus ensuring safe navigation in their vicinity.

It's important to recognize how this setup distinguishes it from other types of vessels, as trawlers with gear extending over 150 meters would typically display different lights, specifically indicating their gear to avoid misunderstandings on the water.