Known as Marine Corps Drive, the route then travels to the northeast through tropical forests along Apra Harbor to the town of Piti.

At Ricardo J. Bordallo Governor's Complex in Adelup, it passes northward through the western edge of Hagåtña.

The drive passes the Paseo de Susana and Skinner Plaza before following Trinchera Beach northeasterly through town.

[3][4] After passing through the Hagåtña and an area of Mongmong-Toto-Maite below the cliffline, the road turns towards the northeast and reaches typically its most congested section in Tamuning at the intersection with Guam Highway 14.

Won Pat International Airport, Marine Drive passes John F. Kennedy High School and the area of Upper Tumon.

Marine Corps Drive passes the War Dead Cemetery and turns northeasterly with residential areas on both sides of the roadway through Yigo before reaching its terminus at Salisbury Junction, the main entrance to the Air Force Base, where the road continues to the northwest as GH-9.

However, the southbound lanes on the same sections remain posted at 35 mph (56 km/h) due to development on the western side of the road.