I think if Naval has a tech-tree progression, iconic tech ought to show up at T2 or T3. But maybe not!
Some more boat ideas:
PF Avalanche - T2 - A remote controlled drone that races to the target and trigger an ice explosion that renders all targets in the area frozen.
Epsilon Neuromancer - T3 - A parasitic ship/infantry that "enters" a boat and controls it. When the boat is destroyed, the Neuromancer respawns.
HQ Hydra - T3 - The pinnacle of HQ animal experimentation. This is the final evolution of the spook, a horrific monstrosity with hunger for ship scrap. Can heal itself when it destroys ships.
Foehn (Lie)Pleurodon - T3 - Foehn battleship equivalent that fires an array of golden rockers, allowing it to attack both air and ground. When deployed, acts as an incredibly long range SODAR array but cannot fire.
Haihead Siren - T3 - Armed with several sonic arrays, allowing to attack air and sea. When deployed, release an extremely high frequency vibration that weakens the armour of enemy boats around it.
Edited by Tathmesh, 17 November 2017 - 02:18 PM.