Submarine Scripts, SA:MP

#include <a_samp>
#include <zcmd>

main()
{
    print("Autor: KaLu\nPomysł: Jingles");
}

new submarine, submarine_object;

public OnFilterScriptInit()
{
    submarine = CreateVehicle(484, -1899.1563, 1476.7891, 5.7422, 0, 0, 0, 0);
    submarine_object = CreateObject(9958, 0, 0, 0, 0, 0, 180), AttachObjectToVehicle(submarine_object, submarine, 0, 0, 5.7422, 0.00000, 0.00000, 180.00000);
    LinkVehicleToInterior(submarine, (submarine * MAX_PLAYERS));
    return 1;
}

public OnFilterScriptExit()
{
    DestroyVehicle(submarine), DestroyObject(submarine_object);
    return 1;
}

public OnPlayerConnect(playerid)
{
    RemoveBuildingForPlayer(playerid, 9958, -1899.1563, 1476.7891, 5.7422, 0.25);
    RemoveBuildingForPlayer(playerid, 10285, -1899.1563, 1476.7891, 5.7422, 0.25);
    return 1;
}

CMD:submarine(playerid, params[])
{
    if(!IsPlayerInRangeOfPoint(playerid, 30.0, -1899.1563, 1476.7891, 5.7422) || GetPlayerVirtualWorld(playerid) != 0)
    {
        SendClientMessage(playerid, 0xBA1010FF, "Nie znajdujesz się w porcie, przy którym zacumowana powinna być łódź podwodna.");
        return 1;
    }

    new Float:submarine_pos[3]; GetVehiclePos(submarine, submarine_pos[0], submarine_pos[1], submarine_pos[2]);

    if(!IsPlayerInRangeOfPoint(playerid, 30.0, submarine_pos[0], submarine_pos[1], submarine_pos[2]) || IsVehicleInUse(submarine) != INVALID_PLAYER_ID)
    {
        SendClientMessage(playerid, 0xBA1010FF, "Łódź nie znajduje się w Twojej okolicy lub też jest zajęta przez innego gracza.");
        return 1;
    }

    SendClientMessage(playerid, 0xBA1010FF, "Zostajesz umieszczony w łodzi podwodnej.");

    return PutPlayerInVehicle(playerid, submarine, 0);
}

CMD:test(playerid, params[])
{
    SetPlayerPos(playerid, -1899.1563, 1476.7891, 10.7422);
    return 1;
}

stock IsVehicleInUse(vehicleid)
{
    for(new i; i != MAX_PLAYERS; i++)
    {
        if(GetPlayerVehicleID(i) == vehicleid)
        {
            return i;
        }
    }
    return INVALID_PLAYER_ID;
}