I have no idea. It's the only such sensor available to me tho. And I know the Soviets put down a SOSUS array in the Sea of Okhotsk during the time period I'm modeling.
Perhaps I'll have to forego the SOSUS network
I'm building a mission based on Operation Ivy Bells, late 70's/early 80's
EDIT: I can (so far) find no info on the FNQ-10 SOSUS sensor .. neither online nor in the RA/DWX documentation.