[DBeers]

SINS is no longer in use. It was last used on the 637 Class and was replaced in 92-93 with ESGN (electrically suspended gyro navigation)

I resemble that remark... Actually, there was a transition... I was on a 640 Class (656 boat) we had dual SINS and a single ESGM (monitor)

get qualified! ;)

[ChefKeith]

My info comes from a co-worker that is Ex-Sub.

(but I did stay at a Holiday Inn last night)