Sistema De GPS

// OnPlayerCommandText
    if(strcmp(cmd,"/gps",true) == 0)
    {
        if(IsPlayerConnected(playerid))
        {
            ShowPlayerDialog(playerid,5,DIALOG_STYLE_LIST,"GPS","Respawn Civil\r\nHospital\r\n24/7\r\nPrefeitura\r\nDepartamento de Policia","Selecionar","Fechar");
            gpson[playerid] = 1;
            return 1;
        }
    }
// OnDialogResponse
    if(response)
    {
        switch(dialogid == 5)
        {
                case 1:
            {
                switch(listitem)
                {
                    case 0:
                    {
                        SetPlayerCheckpoint(playerid,1242.7544,-1699.2177,14.8672,7.0);
                        format(string,sizeof(string),"~b~Respawn Civil ~w~marcado no mapa.");
                        GameTextForPlayer(playerid, string, 5000, 4);
                        return 1;
                    }
                    case 1:
                    {
                        SetPlayerCheckpoint(playerid,1177.4385,-1323.5903,14.0707,7.0);
                        format(string,sizeof(string),"~b~Hospital ~w~marcado no mapa.");
                        GameTextForPlayer(playerid, string, 5000, 4);
                    }
                    case 2:
                    {
                        SetPlayerCheckpoint(playerid,1351.5773,-1755.7181,13.3459,7.0);
                        format(string,sizeof(string),"~b~24/7 ~w~Marcado no mapa.");
                        GameTextForPlayer(playerid, string, 5000, 4);
                    }
                    case 3:
                    {
                        SetPlayerCheckpoint(playerid,1481.4419,-1764.6077,18.7958,7.0);
                        format(string,sizeof(string),"~b~Prefeitura ~w~Marcada no mapa.");
                        GameTextForPlayer(playerid, string, 5000, 4);
                    }
                    case 4:
                    {
                        SetPlayerCheckpoint(playerid,1550.6753,-1675.6946,15.5132,7.0);
                        format(string,sizeof(string),"~b~Departamento de Policia ~w~marcado no mapa.");
                        GameTextForPlayer(playerid, string, 5000, 4);
                    }
                }
            }
        }
    }
// OnPlayerEnterCheckpoint
    if(gpson[playerid] == 1)
    {
        new string[70];
        format(string,sizeof(string),"Você chegou no local desejado e o GPS foi desativado.");
        SendClientMessage(playerid,BLUE,string);
        DisablePlayerCheckpoint(playerid);
        gpson[playerid] = 0;
        return 1;
    }