On the London Terminal Control radar displays, provided that the Emergency Code is selected whilst the aircraft is within the coverage of the radar source selected at your console and the squawk has been code/call-sign converted, then the aircraft`s call-sign as well as the letters "SOS" are displayed in the label. Therefore if there is more than one emergency at a time the aircraft identities can be easily retained. <img src="cool.gif" border="0"> <img src="cool.gif" border="0">
If the Emergency Code is selected whilst the aircraft is hundreds of miles away, then all you get is the flashing "SOS" when it enters your radar cover.
<img src="confused.gif" border="0"> <img src="confused.gif" border="0">