new Float:Position[MAX_PLAYERS][3];
forward tracker(giveplayerid);

public tracker(giveplayerid)
{
GetPlayerPos(giveplayerid,Position[giveplayerid][0], Position[giveplayerid][1], Position[giveplayerid][2]); 
SetPlayerCheckpoint(giveplayerid,Position[giveplayerid][0], Position[giveplayerid][1], Position[giveplayerid][2],7);
return 1;
}

if(strcmp(cmd,"/tracker",true)==0)
{
    if(IsPlayerConnected(playerid))
    {
  tmp = strtok(cmdtext, idx);
if(!strlen(tmp))
{
SendClientMessage(playerid, COLOR_WHITE, "USAGE: /tracker [playerid/PartOfName]");
return 1;
}
giveplayerid = ReturnUser(tmp);
if(IsPlayerConnected(giveplayerid))
{
    if(giveplayerid != INVALID_PLAYER_ID)
    {
        tracker(playerid, giveplayerid);
        SendClientMessage(playerid, COLOR_GRAD2, "Tracker initiated...");
        return 1;
}
else
{
SendClientMessage(playerid, COLOR_GRAD2,"Invalid id");
return 1;
}
}
else
{
SendClientMessage(playerid, COLOR_GRAD2, "Player not connected");
return 1;
}
}
}