Hephaestus — Fireworks Display Site Planner

1. Firing point

Click anywhere on the map to place the firing point. Drag the pin to refine.

Latitude

Longitude

Next map click places the firing point.

2. Site type

Circular (vertical mortars)Oblong (15 deg angled mortars)

Circular: spectators may be at any point on the perimeter.

3. Articles

Maximum mortar size (Table 3-1)

Maximum emission-effect elevation (m, Table 3-4)

Mortar placement

Mortars are NOT properly buried/racked/barricaded (triples all distances per Table 3-1)

4. Wind (Tables 3-2 / 3-3)

Wind speed (km/h)

Table 3-1 is calibrated for ≤15 km/h wind. Above that, Table 3-2 (oblong) or 3-3 (circular) applies; above 40 km/h the display must be cancelled (Section 3.6).

5. Compute & check

Step 5 queries OpenStreetMap via Overpass API to detect nearby buildings, fuel stations, hospitals, and power lines.

6. Save / load / share

Load site plan (JSON)…

Requires a computed plan. The link points to a stored copy of the full plan (rings, polygon, structures) and lasts one year. Use Download for permanent archival.

Clears the firing point, downrange direction, all inputs, and any loaded shared link.

Map data © OpenStreetMap contributors. Distance rules from the Display Fireworks Manual (NRCan / ERD, Canada). This tool is an aid; it does not replace the judgement of the Supervisor in Charge or AHJ approval.