A more thorough explanation:

DROMONES

Dromones were large ships used for war by recognized navies. They were usually prepared for hostilities.

• The Byzantine Empire used dromones in their navy.
• The dromones were equipped with weapons such as catapults and ballistae.

The examples illustrate that dromones were not just any large ships, but specifically war vessels used by recognized navies. They were designed and equipped for battle, with weapons like catapults and ballistae. The Byzantine Empire is an example of a recognized navy that used dromones.