Torpedoes as things in the water

Combat resolves in the kernel after movement each tick: attack orders, fire modes, a fight the host publishes and the chart draws. Torpedoes are now objects in the world rather than a roll: a spread runs straight and is dodged by manoeuvre; a seeking round turns toward its mark and is fired from further off.

The iron ruleset gains a torpedo boat, and the scripted admiral that pickets, raids and mends has learned to use it.