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Ship's rating (or ship's spelljamming rating, or SR) is a value which refers to the tactical speed of a spelljamming ship. It is determined by the propulsion, usually a helm, which draws power from the strength of its helmsman. Each point of SR tranlates into 500 yards per round of tactical speed.
The following items or additions affect SR:
If playing 3rd ed. or higher, you may refer to SR as Tactical Speed (TS) to avoid confusion with Spell Resistance (SR).