Create a Radar HUD for Phoenix or Firestorm

Most HUD radars in Secondlife use LSL scripts to scan for avatars in a maximum range of 96m.
If you use the third party viewers Phoenix or Firestorm, you can make use of their built-in full sim radar by creating a one prim HUD that will report EVERYONE in the sim and their distance from you.
Because this information is gathered by the viewer from sim data, there are less script delays and lag than having to ping the sim every second as most radars do.
First;
In Phoenix/Firestorm open the menu named Phoenix or Firestorm then open the Avatar List.
In the options tab, enable Update AND Announce keys to HUD.
Next;
Copy the open source script here.
Create a prim and drop this script in to it.
Profit!
That's it.
Attach it to any HUD position or even wear it.
It will display hovertext above the prim with avatar names and relative distance from your position.
You can modify the script to integrate with your own HUD if you are making one and relay messages in other ways (llOwnerSay, llInstantMessage, llRegionSay [if it's communicating with other objects in the same sim]).
For more information check Phoenix/Firestorm Avatar List.