OK, here's the deal:
time: september 1940, just after sundown
place: Grid AK01
Sub: type VIIC
5 G7a torpedoes in the tubes, no reserves, 180 rounds of HE ammo for the Deckgun
GWX 3
This is what I ran into, the escort is a side-guard, the freighter is the third one in the closest row of the convoy, speed is reported as 10 knots
also note the weather report.

This is the view from the Binos. there's an estimated 70.000 GRT in view, and there's more in that convoy. I have 5 eels.
How would you handle this?

As an additional challenge:
There's 7 (maybe 8) ships visible in the screenie, can you name the types,?
from left to right. give it a go
I'll post my approach and results later....