2 .NA upgrade "Update the tech of a ship/unit/plane to the current tech level"
4 .SY "upgrade <s|l|p> <ships|land units|planes>"
5 The upgrade command allows a country to set the tech level
6 of its ships/land units/planes to the country's current tech level.
8 Each ship/land unit/plane to be upgraded must be at least 60%
9 efficient and be in one of the country's
10 harbors/headquarters/airports that is at least 60% efficient.
12 Upgrading costs 15% of the full build cost in money and avail, and
13 reduces the efficiency of the ship/land unit/plane by 35%. Repairing
14 these 35% will then consume work and resources as usual.
16 .SA "build, ship, plane, land, Technology, LandUnits, Planes, Ships"