A patch for the PC version of Battlefield 3 will be launched tomorrow adding a number of new commo rose call-outs that you can make to the entire team whenever you want. Where you previously had to look at a Support player to get the option to request ammo, you can now use the commo rose at any time to request ammo, health, or repairs. Using these requests will trigger appropriate icons on the minimap.
The patch also offers new ways to display the minimap - you can now choose between Map, Satellite or Hybrid view mode. In addition, horns have been added to all jeeps in the game, and all air vehicles have now IR flares. Visit this page