Relay weekend · support crews

Runner progress estimator

Support-side estimate — not a tracker. For race weekend crews: place the runner along the mapped Cabot leg route, read distance covered and remaining along the route, and get a rough sense of pace and expected exchange arrival if the runner’s average pace so far stays constant. This is not live athlete tracking and it does not replace official timing.

The math is simple on purpose: snap your position to the course route plus elapsed time since the start you enter, then constant average pace for the remainder of the leg. Use it to anticipate handoffs and manage timing uncertainty — not as a precise forecast. GPS drift, exchanges, bridges, and differences between the recorded route and the actual course can dominate errors; when the pin is far from the route, treat outputs as unreliable.

Limitation: projections do not incorporate terrain or elevation into pace — hills, footing, and weather can move real pace away from this straight-line-on-the-polyline model.

Scheduled starts default from organizer PDF times (America/Halifax) bundled with the site; override with the observed gun or exchange time if the wave left late or early.