You've got a "custom menu" running... that's the icon for "Add Favourite" (It adds one at your current location)
To change or get rid of your custom menu, go to Main menu / Settings / "Make your own menu"
Click through a couple of info screens and you'll get to a list of what icons you can put on screen.
Just un-tick everything to get rid of it, or you might find something else in the list that you *would* like to have easily to hand.
