noun
this ship; the aforementioned ship
Formal, often used in naval or official contexts to refer to the ship in question. 本艦 is a self-referential or anaphoric term, similar to 'this vessel' or 'the said ship'.
本艦はただいま出港の準備を整えております。
This ship is now preparing to depart.
先ほど報告のあった本艦の損傷は軽微である。
The damage to the aforementioned ship, as reported earlier, is minor.