Hey F

ellow Skippers,
It's my first post and If I posted in the wrong section I do apologize.
Just a few questions that keep troubling me-
How to use the magnetic detonator in SH4?
Is the depth knob sensitive to millimeter movements? I mean U gotta know that turning it slowly can produce fraction values for depths??
I saw this and I think techies here could help me out
I usually fire a fish at the draft +/- 1 meter 'safety'
when one hits I record it in my logbook
Ideas would be appreciated