Find "Mignonette" ship

[Shakaron]

Greetings, commanders!

I have trouble with the mission find "Mignonette" ship. Sure, I could finish my patrol and ignore this side mission, but I'd love to do it.

There isn't much to go on. The sea is vast, not sure where to look for it.

There is a green dot next to it, but that doesn't help much, because in my current time 18 Oct 1939, it doesn't bring me anywhere. In earlier phases of the game, it marked a location to travel to. So I loaded an older save file, noted the location AF4438, then travelled there in my latest save file (where I have made advancements in other goals, such as sinking ships). I searched the area, nothing on the hydrophone. I searched from morning with 2 crew helping the guy on the UZO to maximize view distance. Nothing.

Any ideas where/when or how to find the Mignonette?

[Red_Seven_]

The message should also contain an approximate course and speed of the target. So if it's at position X at the time of receiving message it most likely won't be when you get there hours later.

You basically need to calculate an intercept course with the given data. Nevertheless you should also get follow-up messages about their new position so you won't lose them completely.

Also these missions are random so it's not necessary to put the cordinates as a spoiler here.