[GTAguillaume]

You need a timer. :P

Код:

SetTimerEx("radarspeed",500,1,"ii",giveplayerid,playerid);

EDIT: Hmmm...
EDIT2: what do you mean? The timer?
BTW: Is GetVehicleVelocity not easyer?
EDIT3:

Код:

if(strcmp(cmd, "/radar", true) ==0 )
	{
   	if(gTeam[playerid] == 2 || IsACop(playerid))
		{
	    	tmp = strtok(cmdtext, idx);
			if(!strlen(tmp))
			{
			SendClientMessage(playerid, COLOR_WHITE, "[USAGE]: /radar [id]");
			return 1;
			}
				giveplayerid = ReturnUser(tmp);
  				if(GetDistanceBetweenPlayers(playerid,giveplayerid) < 200)
				{
 					SetTimerEx("radarspeed",500,1,"ii",giveplayerid,playerid);
				}
   		}
    return 1;
	}