http://www.garrysmod.org//downloads/?a=view&id=35115
A Overview and Radar script.
!!!Extract to your /addons Folder!!!!
Useage
Do radar_enable 1 in console
and after that bind a key to +map
Example
bind m "+map"
(You can also try useing alt,but that could be blocked by other addons.)
Facepunch Thread : http://www.facepunch.com/showthread.php?p=9468087
A pretty cool addon. Just be sure to not use it on the STALKER server unless you want a ban :D