What do the little blue squares on the minimap mean?
Solution 1:
Blue ¤ on mini-map means friendly anti-tank mine or friendly C4. You can also see these symbols over them when you're nearby. Even in HC mode.
Solution 2:
I think they are one of the following:
- capture points (the blue square), which your squad leader has designated you defend (the lines from the corners)
- mines: the antitank mines (and possibly claymores) are small squares (I seem to recall them being circles) with corner lines
a picture of it would help greatly, just to be sure, but I'm quite sure it's mines. will try to make my own screenshot later.