Why horn weapons not working on ships and other clases than cars !!!???

[h4wek 41]

I am making ships and would like to use horn on them but most easy way to do that not working on ship clases even other clases too, this work only on cars - is any way to configure it for ships?

 

class CfgWeapons {
    class TruckHorn3;
    class HWK_libertyHorn: TruckHorn3
    {
        drySound[] = {"\HWK_LIBERTY\sounds\destroyer_horn.ogg", 1, 1,500};
        displayName = "Ship Horn";
        //muzzlePos = "horn";
    };
};

 

when I use it on quad workk perfect but when i am driver of ship or boat nothing happen - weapon is visibile on list but not making any sound - so now i must use scripts for that like event handler - but why i must do that in that way what problem is with this limitation?.