# Grg Builder

> Place Gridded Reference Graphics (GRGs) on the map

- Skill: `nimbusxr/grg-builder` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add nimbusxr/grg-builder`
- Raw SKILL.md: https://api.skillmd.com/api/skills/nimbusxr/grg-builder/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: nimbusxr (https://skillmd.com/u/nimbusxr)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/nimbusxr/grg-builder

---


# GRG Builder

Places a Gridded Reference Graphic (GRG) on the ATAK map. GRGs divide
a geographic area into a labeled grid for coordinating operations.

Uses ATAK's built-in `CustomGrid` via `GridLinesMapComponent` — no
external plugin required for grid placement.

## Rules
- ALWAYS call `build_grg` to change spacing, size, or position — never assume a previous call is still active. Each call replaces the current grid.
- When the operator asks to adjust an existing GRG (change spacing, resize, move), re-call `build_grg` with the updated parameters.