Interesting vessel, Mike! First time I see a containership that has cranes' booms raised the whole time she's at sea. Guess such way need the aerials above the bridge to be spread so apart, hence the goalpost there. Also notice the upside-down lights mast hanging from that goalpost.
Further looking - the bow deck crane is the only one that has a boom support - but it's only used when there's no double-stack of containers before that crane, otherwise the boom rests on top container!