# 📐  L2 Spec — GNSS Positioning and Navigation — Nominal + Mismatch Specs

**ID:** `L2-466-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-466`](/artifact/l1/L1-466)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.28 · **Delta tier:** 5
> **⛓ On-chain block:** 41555301

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N sat | — | 4 – 30 |
| Ionospheric tecu | — | 0.5 – 50 |
| Multipath sigma m | m | 0.1 – 5.0 |
| Elevation cutoff deg | deg | 5 – 30 |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.5 + 1.0 * (ionospheric_TECU / 5.0) ** 0.3
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.28 |
| Delta tier | 5 |

## 4. Fingerprint

`1d6d1f75ce14b9e5c970fa191f6aaeb72d49033792d2211dbcedc765ebc76246`

## 5. On-chain Registration

- **Chain hash:** `0x69bf95794b072ebfb9dd4d5e96f97549fa48dcb5c63afd2527c91053a884f0e8`
- **Chain tx hash:** `0xe48a7b487bb375c57933461ebe0e3c137549274289c22572e623535f6176b4a8`
- **Chain block:** `41555301`

---

## File Mapping

This bundle consists of: `L2-466-001.md`, `L2-466-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-466-001.md` | Source of truth — edit this | Human or LLM |
| `L2-466-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-466-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._