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I just remembered some tips for you. In order to be able to appraise all of the items, you must increase your captain's training in appraisals...the higher it is the easier to appraise all items. I never had any trouble appraising all the items.

Also, increasing the training of your weapons and engineer officers will make combat way easier. By the way the MK30 torpedoes are pretty useless so don't waste your money purchasing them.

Hope this helps.