My DS has mentioned that he is in need of a captain murphy deck officer 1 study guide. I have found them online: however, was wondering if parents and mids could please chime in as to the benefit of such study guides. Besides deck officer 1 were any other guides especially helpful? Any other books more helpful? Does any state parents association sell these study guides or does anyone recommend any store in particular to purchase from? As always, thanks for the collective expertise. PS Before I get bashed, DS at sea, no internet, just doing the research for him, he will purchase himself.