LNAV armed during ILS approach

[kjjj11223344 48]

I have seen on some videos that LNAV seems to be armed when an ILS is being flown. Here's an example video, [media=]

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At 11:35, the captain and FO talk about LNAV being armed, and you can see LNAV in white on the FMA. Is this a customer option on the NG, or is there something specific required to be done to get LNAV to arm so that it will re-engage in case of a go-around?

[Barnstormer1 0]

Go from Appr to LNav button on the MCU.

[rsvit 16]

This option called TO/GA to LNAV and might be added in SP2. With it LNAV arms automatically.

[kjjj11223344 48]

This option called TO/GA to LNAV and might be added in SP2. With it LNAV arms automatically.

Good to know it might be implemented, as it can help during high workload go-rounds.