As far as channel markers go, you keep the red lights to starboard (right) when you're inbound. The only multiple lights I can think of would be range lights, which you line up to make sure you're steering a straight course through a channel. Don't know if HSC has range lights, though.
Maybe I'm thinking of New Orleans. They have actually signal lights in the Mississippi. Guess that's the only place that does. (Never mind, it's getting late)