When im playing RTCW sometimes i see a little yellow arrow pointing on my screen at stuff and I dont know what it is?
I know there is a mod (bani?) that allows LTs to give players commands to move to places. If your talking about MP, these are probably the directions to where a LT wants you to be. I also know that the mod is server side only, so you really wouldn't know your playing a server running the mod unless something specifically says so.