Two identical fleets. One year of real dispatches. The left fleet uses Seattle's actual medic posts. The right one is yours to configure. Both simulations run in this page, call by call, from the same data — nothing here is a recording.
Dynamic ambulance relocation moves idle units between posts to chase demand. It is one of the most studied ideas in emergency-services operations research and a live product category. The question this instrument answers is not whether it produces a number, but whether that number survives being charged the cost of the moves — and whether simply parking the same units somewhere better would have produced more.
Both panes consume the identical call stream at the identical clock. Service durations are the same hash-seeded draws the Python study used, exported per incident, so the two engines agree exactly. On load the browser re-runs the full year for every policy and checks its answers against the Python reference; the badge above reports the largest disagreement found.
Recomputed live. Drag the relocation-cost slider and this redraws; the flat line is the policy that never moves.