It's well established that the Simon Bolivar (SSBN-641) was trailed by the Victor-class K-147 in 1985. The November that trialled the SOKS installation also trailed a US boomer departing from Guam during September - October 1969.
The Soviets also likely had advanced knowledge of US boomer deployments from intercepting SOSUS tracking reports issued when US submarines were detected by SOSUS.
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