Japan Becomes 1st Country Ever To Fire Electromagnetic Railgun From An Offshore Vessel::Japan has successfully test-fired a medium-caliber maritime electromagnetic railgun from an offshore platform, as it continues to advance its defenses in the face of burgeoning regional security threats.
They’re pretty similar, in that both use electromagnetic forces to launch a projectile.
Gaus cannons use a field around the projectile, applied by wires wrapped around a tube, whereas railguns use two rails touching the projectile to conduct the magnetic field through the projectile.