CA missions - choose map non-randomly?

[N.I.B.]

Chapter Approved maelstrom missions:

DEPLOYMENT
The players roll off and the winner decides
who will be the Attacker and who will be
the Defender. The Defender determines
which of the standard deployment maps
is used in the battle (see the Warhammer
40,000 rulebook) and selects one of the
deployment zones for their army. The
Attacker uses the other deployment zone.

Seems like the only reason CA refers to the BRB is because the maps are in there. Not because you should use the random method of deciding maps that BRB uses:

When playing matched play missions, you must randomly select one of these deployment maps. To do so, one of the players simply rolls a D6 – you then use the deployment map that corresponds to the result. The mission will typically say which player makes this roll

How do you play it?

[hivefleetkerrigan]

A friendly game? I'd roll.
A competitive game (especially against a jerk)? I'd probably pick the map.

[N.I.B.]

I want to know what is the correct way to do it.

[garg]

I would say it is randomly determined it's just that the defender is the one determining (rolling the d6). We had tha similar discussion in my playing group when we tried ITC missions for the first time.

In the except you posted there is nothing about selecting choosing deciding the deployment type. I see determine as a synonym to generate here. This sentence answers two questions:
How is the map your generated (see brb) by whom (defender).

[sarcron]

I've always gone by what I've been told both by other people and by others in the store.
That is, whoever the mission says determine the map, but that's all it says- they determine not choose- and then go to the rule book and they 'determine' which map by what it says- to roll. It also means that the person doesn't just choose whichever map suits them better.

[N.I.B.]

Anyone else? What's your take?

[sneggy]

Roll, previous chapter approved had a player 'determine' the deployment map too.

[No One]

It's not even previous CA, that's been the case since BRB. This hasn't changed anything, the only missions that work differently are Open/Narrative.

[mattblowers]

As stated before, you determine the deployment map. The rules state that the determination is made by a roll. In a narrative game just for lols it won't matter, if you want to pick it, pick it.

[N.I.B.]

Thanks for the feedback.