I wouldn't play without it. It changes all the campaign layers to be historically correct. You run into correct convoys and they're spread out correctly with the correct ships that we're in the actual TF or convoy.
Stock just randomly spawns convoys. RSRD spawns the convoys that actually happenes, so you run into huge convoys. It also add's planes and ships, deals with plane traffic, ect. Plus you get correct map labels.
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