Unescorted CV (and other capital ships) were not at all uncommon in "home" waters, in other words, close in to shore, as the IJN would transfer ships between bases sometimes, and would rely upon regular local shore patrol vessels to guard them. They were also known to do shakedown cruises in home waters, preparing a vessel for missions, again relying on local patrol vessels for protection - at least until they realized the US subs were actually able to "sneak" into the "home" waters.
My guess with the run away spawns you encountered in GFO, those were probably from using the previous Save folder with the v1.3 files still in it. Even if you do not create a Save, the game writes to the Save folder, and uses the data there to pull most of its information from. Then, as you mention, the interruption from Windows "shelled" you out from the game, and that can lead to corruption in all things in the game, especiall 3D. I was just doing a "test" mission for PhotoTargets I'm doing for FotRSU, and I was also interrupted by Windows 10 update, and lo and behold, the 3D artwork for the shore that I was about 3500 yards off of completely disappeared. All I saw after that was water. If I looked on the NavMap, there was land, still being the same distance from shore - but when I looked through my periscope, there was no land visible. I could still target the PhotoTarget and take a picture, but even the "picture" that goes to the Captain's Log was nothing but open water... very strange, and unfortunately, "normal" game activity. I Saved the scenario, exited the game, came back in and loaded the scenario, and my "land" is back, and the pictures now look fine also - except that one... There is still just open water in it... weird
