Just an afterthought...
Well, knowing the present weather conditions is helpful. I don't recall if it's in the stock game or added by GWX, but torpedo failures due to weather conditions do occur, particularly for magnetic pistols in high sea states (at wind speeds that prevent use of the deck gun/flak gun).
Although it appears you're not using h.sie's Patch, for those that are using it, knowing the weather conditions is extremely important. With the Patcher's Torpedo Failure and re-loading features enabled, you need to know the current wind speed.
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