The 4th event of the 2026 Nav-X season will take place at the Presidio in San Francisco, CA and the city streets outside the park. The start will be in the Main Parade Lawn of the Presidio. The scale will be 1:10000 with 5 meter contours across the whole area. This event will use the app "MapRun" for timing on your own schedule. The competitive window for this event is May 12 - July 12. Results during this time period will be included in the official results and accrue Nav-X Challenge series points but the course will still be available on MapRun until 2026 Dec 1, after which it will move to the archived courses. Upon registration, you will receive (1) registration confirmation, (2) within 24 hours, a separate email with links to map documents.