Vehicles and the -1 shoot penalty

Hi

Can't see that this has been asked already. If it has please redirect me there

Where is the rule that states vehicles don't suffer the penalty for moving and firing heavy weapons? Its stated in battle reports and articles but I just can't see the corresponding rule in the main book or the index.

Is it in the print version but not the digital version?

Thanks

To my knowledge such a rule does not exist.

The only thing I can think of which covers it is the rule for Dark Lances, found in the the stats for Dark Lances, which says that they count as Assault rather than Heavy if mounted on a vehicle.

That's it then.

In the digital index that rule is missing.

Thank you. It has been irritating me for ages.

So everyone gets a -1 to hit when he moves. It doesn´t matter if it´s infantry or a tank. The weapon is heavy? They get a penalty.
But our heavy weapon dark lance becomes an assault weapon when mounted on the raider:
Profit.