with day markers at the tops of their masts, which were the first objects seen from an approaching ship. These operated both at night and in fog, from one hour before sunset to one hour after sunrise and were in addition to the lights. The markers were primarily red and occasionally white, and their designs varied. Filled circles or globes, as well as pairs of inverted cones, were the most common designs among them.

For visibility purposes, most later lightships had bright red hulls that displayed the