On the NG,you have 3 ways to exit the Loc/gp .
Press Toga or deselect frequencies or A/P and FDs OFF then ON.
TOGA will give you guidance for 15 degr nose up,if you are close to your GA altitude,it is obviously not the mode to use.(some have suggested to press toga and then straight after disconect the AT..not my favourite..).
Deselecting frequencies allows you to use a more apropriate pitch mode especially for a descending missed approach.
A/P OFF and AT OFF when time or knowledge or position awareness are not sufficient to mess about with the automatics.
Last edited by de facto; 2nd January 2013 at 03:35.