Like a lot of good tuna spots, the Hooter is named for a landmark, a horn or whistle buoy (the kind you can hear before you see) that marks a piece of water known to hold bluefin. The buoy itself is not magic; it simply marks structure, current or a bait concentration that draws fish, and gives anglers a reference point to fish around.
The ground
Fish the structure, current edges and bait in the vicinity of the buoy, not just the buoy itself. As always, the fish relate to the bait and the water, so use the mark as a starting point and search out the life around it.
How to fish it
Work it like any tuna ground: troll to locate, then jig or pop the fish you find. Match the local bait.
Tip Do not fixate on the buoy itself, fixate on the bait near it. The Hooter is a reference point; the fish will be wherever the bait and current set up, which might be a half-mile off the mark on any given day.