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Originally Posted by Packerton
I never ever used the Observation Periscope.
Attack just feels more efficient as its harder to spot and has no disadvantages that put it under the ob periscope.
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It has one very big (kinda cheaty) advantage: it was a skyscope. Before surfacing you can check for aircraft. But below you can use it to keep tabs on the destroyer looking for your blood and its DC's, because you can look straight up. On flank speed, depth of 100-130 and manual rudder you can evade DC's endlessly. Any deeper and you can't see the surface anymore, so DC's just appear out of the murk.