"航路标志灯船" can be translated into English as "route marker light vessel" or "channel marker light ship".
"Route marker" or "channel marker" refers to the device or object used to mark a specific route or channel for navigation.
"Light vessel" or "light ship" specifically denotes a ship equipped with lights to serve as a navigational aid, typically anchored in a fixed position to mark a hazardous area, a channel entrance, or other significant navigational points.
Both translations convey the meaning of a vessel equipped with lights that serves as a navigational marker along a route or channel.