Cannon

In fiction, anything that is deemed "true" becomes canon, things out side of canon include events that have been retconned, character traits that have been discarded, fan fiction, etc.

In "Adventures at Sea" canon is referred to as cannon, for obvious reasons.

Our current ship has 8 actual cannons, so you only ever need to remember 8 facts about the ship until we upgrade. (jk jk lol)