At 3 kts your TA will scratch the bottom so range of detection will be zero :P
Btw if you wanna make mission just put your 688i and Delta IV (at speed 5 kts) and check it yourself because it depends on many factors:
- sound propagation
- SSP Type
- bottom type
- weather (rain)
- sea state
And of course mod you play (vanilla, RA or LwAmi)
and which one TA you use port/starboard (TB-16/TB-23)
