Look man I'm not going to tell you how to play but my perspective is it takes something away from the gameplay to know exact figures like you're asking for.
Real captains had to rely on intuition and standard operating procedures when engaging the enemy.
Part of the excitement comes from seeing how well you are able to stealth around without being seen/heard. All of which can be improved through learning "on the job" without knowing the exact figures you're asking for.
I guarantee with a bit of experience you will be able to rely on your own judgement for any scenario you face.
Good Luck!
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