Quote:
Originally Posted by tomoose
In US subs the observation scope always has this problem and you have to come up a bit. The attack scope however should not be a problem in calm seas at the designated periscope depth. Are you sure you are not using the observation scope instead of the attack scope?
This applies to the US subs, I don't know if the same can be said for the non-US subs in game.

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That would be my guess. He must be using the observation scope. If he just comes up a foot or two in depth, that'll solve it.