They grouped ships by year, and by the type of group. 1-2 merchant traffic, convoys, TFs, sub hunter groups, etc.
So for the year (half year in the 42a vs 42b type cases) you open they type you wanyt (these need to be opened as RANDOM layers, BTW) and look at what's inside. You can right click to add a new random group, at which point you'll get a menue to populat the group with ships along with % chance for each ship to happen, etc. Make waypoints to Attu or wherever, and there you go.
tater
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