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SC speed

#1
The first ship built by any emperor, the small cargo is an agile resource moving ship that has a cargo capacity of 5,000 resource units. This multi-use ship not only has the ability to quickly transport resources between your colonies, but also accompanies larger fleets on raiding missions on enemy targets. [Ship refitted with Impulse Drives once reached level 5]

5th level of what, shipyard, impulse drive tech?