Besides which, isn’t the Klub supposed to be able to accept in-flight course corrections or updates? If so, the problem goes further than just the sub’s gyros...
http://www.bharat-rakshak.com/NAVY/Klub.html
It doesn’t look like this thing has any of the goodies found in Western systems other than a GLONASS reciever,which is no good till the Russians put the entire constellation up.The Klub seems to be primarily a post-cold war export ‘One size fits all’ system with mimimum frills.