- Published on
Walker Safety Calculator
- Authors
- Name
- Jacob Walker
- @JacobWalker03
Walker Safety Calculator
I originally created the Walker Safety Calculator on November 16, 2025. I’ve now published it with the web UI front end—this post marks that release.
Try the Walker Safety Calculator →
What It Does
The Walker Safety Calculator computes safety zones for artillery operations using M28A1/A2 (Combined) Safety data from Table G. It produces Surface Danger Zones (SDZ), Target Selection Boxes (TSB), Area F (LDA and NHA), flight corridors, and exclusion areas—all based on range to target (8,000–15,000 m) and the standard W, X, Y, and target box parameters.
The app supports three calculation methods:
- Point-to-Point — Direct firing point and target; simplest case for a single engagement.
- OpArea — An operational area (battery center + radius) and a usable portion of the target area; accounts for battery dispersion.
- Firing Point — A specific firing point with a usable portion of the target area; single firing point, flexible target zone.
Inputs are MGRS (Military Grid Reference System); internal math uses WGS84 geodesics and local XY for geometry (line intersections, arcs). You enter firing point, target (or battery center + usable portion corners), and method-specific options, plus shared values like LDA distance, NHA distance, and exclusion areas. The backend returns full geometry; the web UI shows a summary, debug output, and a Leaflet map with SDZ, TSB, LDA, corridors, and markers.
Two Interfaces
The calculator has two interfaces:
- Desktop GUI — A tkinter app for local use.
- Web front end (webskin) — A single-page browser UI that talks to a Flask backend. The deployed app uses this: one HTML page with inline CSS/JS and Leaflet for the map, no build step. You pick the method, fill in MGRS and distances, click Calculate, and view results and the map.
So the “release” I’m referring to is the published web UI at walker-safety-calculator.vercel.app—same Python core and Table G logic, now usable from the browser with a map and clear summary/debug views.
Tech Snapshot
- Backend: Python, Flask, pyproj (WGS84 geodesics), MGRS conversion, Table G lookup, and shared geometry utilities (ray-segment and line-line intersection, arc generation).
- Web: One HTML page, vanilla JS, Leaflet (CDN);
POST /api/calculatesends method + inputs and returns full result plus debug output for the map and tabs.
If you’re working with artillery safety data or Table G and want a reference implementation or a quick way to run the three methods and see geometry on a map, the Walker Safety Calculator is available to use and explore.