Chart Symbology Validator for Nautical & Aeronautical Cartography
Validate nautical and aeronautical charts against IHO, ICAO, and ISO standards
What You Can Do
You can rapidly validate chart elements—symbols, legends, color schemes, abbreviations, and metadata—against authoritative international standards including IHO S-101/S-57 for nautical charts and ICAO Annexes 4 and 15 for aeronautical charts. Claude identifies symbol inconsistencies, flags compliance risks, detects obsolete symbols, and generates correction documentation to support chart approval workflows and ensure navigation safety.
Features
Cross-references chart symbols against official IHO and ICAO symbol dictionaries to verify correct placement, appearance, and usage
Checks that all symbols, abbreviations, and notations in chart legends are complete, accurate, and standards-compliant
Verifies color palettes meet international specifications for chart type, ensuring visual distinction between feature classes
Validates chart datum declarations, projection parameters, and coordinate system metadata for cartographic accuracy
Identifies and validates placement of navigational hazards, restricted areas, traffic separation schemes, and airways against standards
Detects unintended symbol changes and discrepancies between chart editions to prevent silent errors during updates
Produces structured audit documentation showing symbol-by-symbol validation results and remediation recommendations for approval workflows
Checks conformance of text labels, abbreviations, and fonts against IHO/ICAO conventions
Example Output
Chart Validation Report: Nautical Chart NZ-101
-
✅ Compliant Elements (145/156 symbols):
-
Light symbols match IHO S-101 luminous range color coding
-
Danger/wreck symbols positioned and styled per specification
-
Bathymetric contour labeling consistent with standard depth intervals
-
⚠️ Non-Compliant Issues (8 findings):
- Restricted area boundary (symbol 16.07) uses incorrect dashed line width — should be 0.5mm, currently 0.3mm
- Magnetic variation rose lacks IHO-required declination date label
- Three buoy symbols use outdated color palette (pre-2020 IHO revision)
- Legend entry for "Small craft anchorage" missing ICAO equivalent notation
- 📋 Corrections Required:
- Update 3 symbol color definitions to match current IHO S-101 palettes
- Add magnetic declination date to compass rose (required for chart validity)
- Verify buoy specifications against latest S-101 symbol library
✓ Metadata Validation: Datum (WGS84), Projection (Mercator), Scale (1:50,000) — all compliant
What's Included
- SKILL.md instruction file with IHO/ICAO standard reference framework:
- Chart Validation Checklist: Symbol-by-symbol audit template covering nautical and aeronautical chart types
- IHO/ICAO Compliance Matrix: Quick-reference guide mapping chart element types to applicable standards
- Correction Report Template: Structured format for documenting non-compliant findings and remediation steps
- Symbol Library Cross-Reference Guide: Index of common chart symbols with standard codes and compliance requirements
Who It's For
- Nautical Cartographers — Validating chart symbols and legends before publication to IHO standards
- Aeronautical Chart Specialists — Ensuring chart compliance with ICAO Annexes 4 and 15 for aviation safety
- Chart Quality Assurance Reviewers — Conducting systematic audits of updated chart editions across symbol libraries
- Hydrographic Surveyors — Verifying chart data conversion and symbol encoding in digital chart production workflows
- Chart Approval Authorities — Generating compliance documentation for chart certification and regulatory sign-off
Best For
- Pre-publication validation of nautical chart editions against IHO S-57 or S-101 specifications
- Audit of aeronautical chart updates for ICAO Annex 4 compliance before distribution
- Symbol consistency checks across multi-sheet chart series or chart families
- Detection of color palette, line weight, or typography violations in digital chart production
- Compliance documentation and correction reporting for chart approval and archival workflows
You might also like
Conduct rigorous corridor-level capacity assessments that balance competing modal demands within constrained right-of-way. You analyze existing conditions across all transportation modes, identify true capacity constraints versus perceived limitations, and generate defensible recommendations for modal reallocation—all grounded in traffic engineering principles, transit operations data, and urban design standards. This skill moves beyond single-mode optimization to deliver integrated corridor function recommendations that stakeholders can act upon.
You can systematically extract elevation data from LIDAR, GPS surveys, and government sources, then validate contour line accuracy against field observations and reference benchmarks. The skill helps you select appropriate contour intervals for terrain complexity, identify data anomalies and interpolation artifacts, and generate slope analysis and aspect maps that communicate terrain complexity to planners and engineers with confidence in accuracy.
You can generate detailed cartographic specifications that standardize design decisions across your GIS projects. This skill produces complete style guides covering color schemes, symbology, typography, layer hierarchies, accessibility standards, and generalization rules—eliminating manual documentation and ensuring compliance with cartographic best practices and WCAG 2.1 accessibility guidelines.
You can identify slow spatial queries, analyze PostGIS execution plans, design optimal spatial indexes (GIST, BRIN, SP-GIST), and restructure database schemas for efficient land use analysis, zoning verification, and infrastructure mapping. This skill helps you troubleshoot why intersection queries timeout, optimize buffer operations on large feature classes, and accelerate web mapping service delivery without requiring application code changes.
You can rapidly audit environmental assessment documents against 40 CFR 1502 and CEQA Guidelines, extracting compliance requirements and flagging statutory violations before agency submittal. The skill evaluates mitigation measure enforceability, specificity, and monitoring language while cross-referencing regulatory citations and identifying missing NEPA/CEQA-required elements. This accelerates quality assurance workflows and helps junior planners learn the statutory framework through structured, document-specific critique.
You can analyze reported or observed zoning violations using a structured assessment framework that matches conditions to specific municipal code sections, scores violations by enforcement priority, and generates violation notices with correct legal citations and remediation language. This skill helps you build case files with evidence documentation that meets discovery standards and prepares you to defend enforcement decisions during administrative hearings or appeals.
You can analyze complete rezoning petitions, conditional use permits, and variance applications by comparing them against your jurisdiction's comprehensive plan, zoning ordinance, and precedent decisions. Claude generates structured findings of fact, legal reasoning, and recommendations that demonstrate rational basis review compliance and consistency with established zoning criteria, creating documentation that withstands administrative scrutiny and public challenge.
You can conduct structured rezoning analyses that evaluate petitions across multiple planning dimensions: consistency with adopted comprehensive plans, compliance with zoning code criteria, infrastructure capacity, neighborhood character impacts, and public benefit analysis. This framework produces staff reports that withstand legal scrutiny and provide decision-makers with clearly documented alternatives and planning rationale for approval with conditions, approval as-is, or denial recommendations.