A battleship equipped with a EMP Detector, and a sonar that activates an EMP force-field, thus making the ship immune to EMPs, the sonar can also detect enemy battleships and missiles, bullets, ECT. The main weapon on this ship is the rapid fire launcher, capable of firing over 5,000 rounds per minute and reloads automatically, as a last resort, the ship can fire a highly-concentrated beam of ultraviolet energy (basically a laser beam)
We will use fleets of these for trades, blockades, defense, and war.