Dates are the main thing. When I do the "File - New" on the menu, and it brings up the Start Date Start Time dialog, it can be difficult to remember what I put in there most times (
), but it is on the "Mission - Parameters" menu also, so consult that. You want the submarine to enter the mission at that time. You can change either setting, it wouldn't matter, just so long as they match. Of course, you need to use a submarine that is valid for the date chosen. A really BIG thing with the ME and the player's sub, is on the Properties page for the sub. So right-click on the sub you put in and choose "Properties", or select the sub in the explorer tab of the right-hand portion of ME, and choose properties. In that dialog, adjust the GameEntry date and time if desired, pay attention to that "Human Controlled" tick box, and get rid of the "Delete on last waypoint" thing also. You do NOT want to automatically delete yourself... but the main thing is "Unit version date". If your scenario starts on 22 Dec, 1943, set the version date to 12, 1943. You sub should no longer show as "Unknown" on the menu.
Now right-click on your Passenger Liner, and see when you have it entering the game, and do the same for your escort. If you are using a scripted liner, and an RGG (Random Generated Group) for the escort, you will often find that the "clock" has to run for a whole day before the RGG will generate, so it will be a day behind the scenario date. Also, if you are too close to the RGG, it will not generate. Now, one way to avoid that is to have it enter the game 24 hours and one minute before your sub, but even then, RGG can be difficult, so I would skip trying that for now, just enter a named ship for simplicity's sake.
Of course, you mission's Saved name must match the folder name that you Save it to in the SingleMissions folder, but on the "Mission - Language localization" menu, it doesn't have to match, so you can name it whatever you want there, and that is the name that will display on the menu. In other words, you could save the file as "000167Adubdub.mis" in the "000167Adubdub" folder, but have that "Language localization" setting for "mission title" set to "My Wonderful Test Mission", and that's what will show on the menu, not the "coded" name you used for file name and folder. Use the "Mission Briefing" to put in some text to remind you of what you did.
