The Gauntlet

3.7 km (3,655 m), Harbor Mouth to Fort Sumter · Positions in degrees and decimal minutes, then decimal degrees (WGS 84)

• A sprint is the time between crossing the Harbor Mouth gate and the Fort Sumter gate, each crossing interpolated between the two fixes either side of it.
• Each gate is a 900 m line across the channel, square to the big ships' measured centreline.
• A gap longer than 150 seconds between the fixes around a gate, or longer than 300 seconds between the gates, makes the sprint sparse; a gate crossed twice, or a speed under 1 knot between the gates, sets it aside. Only clean sprints count.
• The gates stand on the big ships' measured centreline through the channel, not on surveyed lines; the Flyby's window inside the course is a configuration, not approved geography.

Download the marks as a GPX fileFor a chartplotter or a phone app: the gate ends, the centres and the route between them.