How does marking work in MGS 5?

How does marking work in MGS 5? - Woman Marking Her Calendar

I'm a little confused about the specifics of how marking works in Metal Gear Solid 5 Phantom Pain. I have gone through the binoculars tutorial and so understand the basics of aiming and marking but the other details are not really mentioned anywhere. For example are there any time limits around how long a marked enemy stays marked, or if they are out of line of sight or beyond a certain distance? When battling Quiet for example she appears to randomly become unmarked and I'm not sure why that is? Also is there any way to mark with an aimed weapon as oppose to using the binoculars only?






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How do I get quiet to mark enemies?

Once you give the Fire order, Quiet will attack these targets as a priority, in the order you mark them. If you fail to mark any enemies before giving the order then Quiet will use her judgement to attack targets which either pose a threat to you or those that are within range.



MGS V GZ - Classified Intel Acquisition - Fastest Marking of all Enemies




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