right ice flow
yes it does affect your sonar both active and passive to a point, your towed array becomes less sensative due to the colder waters when your nearer the ice say 30 meters or there abouts (hence why my towed isnt streamed most of the time)
the ice makes a loud noise very loud but it can be filterd its harder to filet on the russian subs than americans, but your sonar can pick up things that are not there.
if you go deep your sonar should work as per normal, however running shallow under ice does lead to some deteriaration in the quality of detection.
pack ice is one hell of a pig it moves constantly and therefore is hard to avoid its even modeled in dw the ice does move.
the pack ice can be dodged but you realy need to be on the move all the time
find a decent sized hole in the ice and surface there. but if you want my advice dont surface at all unless need be do everything in your power to stay below it cause it makes it alot better and you dont run the risk of damaging sensative equipment or the sub
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