Occasionally when I look on the map in the pipboy I see a freaky icon like it's kind of like a warning symbol and it moves around, most of the time it's not there. I have no idea what it is, often I've gone to the location it's hovering over and have found nothing at all. Today it was showing as at the Castle and I fast travelled there and there was nothing weird, it's just like a phantom. Has anyone else seen it?

If its a square with a line coming out of it, thats your quest marker the only other one I can think of might be power armor icon but that looks like a skull.

It is a skull yes, but why would that appear? I have about 15 sets I keep at Sanctuary or The Castle, I've seen it a other places though and I only wear PA just to take it back to base.

I marks the spot of the last power armor you left. Doesn't matter if you have a million at another base. Even if you get in for just a second, it is your new marker. That is saying if it is the PA marker

It's the "Dude, where'd I park my Power Armor?" icon. LOL