Historical date. Historical location.
Have you read the whole section on Weserübung in the GWX manual? I would strongly recommend starting there first. There are also footnote links to webpages containing more information and detail. Who knows? You may find some of you subsequent questions answered while perusing the manual.
Anyway, I'll leave it to someone like BBW to give you the
exact position of the ships in GWX, so you can rendezvous with them easier on the date. The problem is, IIRC, that the ships won't spawn/appear if you are there waiting for them. But BBW (or someone else) can clarify that if it is a problem, or dismiss it if I'm wrong.