If your mid-round, stay crouched and walk slowly up this narrow walkway- sniping anybody who may rush around the corner. When your team's home flag is 'A' immediately head to the right when the round begins. The key to success here is to stick to the side of the boat with the walkway (or balcony) extending out over the water.
You don't need to be on a coordinated team, or even using your mic, to successfully defend or attack 'B' flag on Hijacked (although it helps!). The two cabins on either end provide a second level high point for snipers trying to clear the way for attacking teammates. The team that can hold 'B' flag the longest in Domination will usually win each round since it's easy to defend your opening flag as well.