yes alot.
single merchants will try to flee at max speed away from your sub when they spot you. Convois will evade a lot. Small convois will scatter after loosing some of their escort.
Enemy ships will spot you upon horizon during good visibilty conditions. Raising up periscope is dangerous. During daylight merchants can see it from 2 miles. Alerted escorts even better. Destroyers are a lot smarter, they drop their charges not where you are but where you are going to be... and much more.
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