The double-loop format creates a specific pacing dynamic that's different from both point-to-point courses and single-loop courses. Here's how to think about it.
Miles 1 to 3 (Newport, with the crowd). The combined start with the half marathon field means congestion for the first one to two miles. The streets are wide enough to handle it, but expect some weaving. Don't chase gaps. Let the crowd sort itself. Your pace in the first two miles doesn't matter as long as you're not sprinting.
Miles 3 to 7 (Loop 1, South). The course heads south through the waterfront districts and toward Liberty State Park. The terrain is dead flat. The Manhattan skyline is on your left. This is where you settle into goal pace. If you're running with a pace group, lock in now.
Miles 7 to 13 (Loop 1, Return). The course winds through neighborhoods and industrial areas before returning to Newport. Some rough road sections here. The aid station spacing is roughly every 2 to 2.5 miles, which is wider than some larger marathons. If you're particular about hydration timing, carry a small handheld or plan your intake around the stations.
Mile 13 (The Mental Moment). You pass the start/finish area. Half marathoners are finishing around you. The crowd is cheering for them. You keep running. This is the hardest mental moment of a double-loop marathon. Have a plan for it. Some runners use the moment to take a gel and reset mentally. Others focus on their pace group ahead. The worst thing to do is look at the finish line and think about stopping.
Miles 13 to 20 (Loop 2, Reversed). The reversed direction changes the feel. Familiar landmarks appear from new angles. If there was a headwind on loop one, it may be a tailwind now (or vice versa). Your legs know the course, which eliminates uncertainty. You're running only with marathon runners now, so the field is thinner and quieter. This can feel lonely or liberating depending on your mindset.
Miles 20 to 26.2 (The Close). The course returns to the Newport waterfront for the finish. The last few miles are flat. The skyline is ahead of you. Runners have noted a hydration gap between roughly mile 21.8 and mile 25, with limited shade. Bring your own water or plan to carry from the last station. The finish at Newport is well-supported with crowd noise building.
The core pacing principle for a double loop: don't run loop one faster than loop two. The temptation on loop one is to ride the energy of the combined field and the spectator support. If you do that, loop two, which is quieter and lonelier, becomes disproportionately hard. Run loop one at goal pace. Run loop two at goal pace. A double-loop marathon is a discipline test more than a fitness test, and the discipline is saying no to free speed on the first loop.