A red cross plus sign on map

Hi, I have noticed that a red crosshair, or plus symbol has showed up on the map. I tried zooming in but there is no information on it. Have I turned something "ON" without realising it?

Are you able to tell me what it is?

Screen Shot 02-12-19 at 02.18 PM.jpg

EDIT - UPDATE
After reloading the page a few times it has now vanished. Not sure what I did.

Attached Images

• Screen Shot 02-12-19 at 02.18 PM.jpg (91.9 KB)