Tips on stalking the Diesels?

[Stewy1]

Hi everyone,

I know this has been covered many times before - but wasn't sure where to look.

What are your tips to stalking diesel boats?

I was in a Flt1 688 boat (3kts at 800ft - between Sri Lanka and India), looking for a Pakistani Agosta. Using the "show truth" mode (it was a 4 hour game!), I got to about 5-6 miles away - off its rear-left (sorry, not sure of the nautical terms) but, switching "show truth off:, Sonar picked up nothing. I was on the same thermal layer, about 500ft below him.

Next thing, it snapped off 4 torpedoes and I had to shoot and bolt (luckily I won the day!)

Questions are, can a 688 pick up a diesel-electric going at 3kts - or is it nearly impossible?

Do you have any tips to detect quiet contacts?

Thanks guys!
Stew