It seems to be working in this way:
As an example, when a crewman becomes CPO, SCPO or MCPO there's 25%, 30% or 35% chance that he gets Increase Torpedo Speed local ability ONLY IF he has these minimum values
Skill Mechanical= 0.6
Skill Electrics= 0.4
Skill Guns= 0.2
In general, the crewmen need a minimum requirement of 3 skills to get the local ability.
Check my previous post for the correct values, in this way you can assign people with the required values in the correct dept. and there will be a chance to develop a local ability when the promotion comes.
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