Yeah, sometimes when I have auto-TMA on (only in the Perry, I swear..), I will sometimes get the auto-TMA thinking an air contact has turned into a cargo ship or something so I see a cargo ship flying through the air haha it's happened a few times in my videos. Link has also been on when this has happened so who knows where it's actually coming from. I can guarantee, though, that if Link and auto-TMA are off, this will not happen
Also, show Allies is indeed analogous to showing truth. Those are real contacts.