Lecture Notes: Understanding Grid References on Maps

Introduction

• Objective: By the end of this lecture, understand what grid references are, when to use them, and how to use four and six-figure grid references.
• Purpose: Grid references are used to locate things on a map, specifically Ordnance Survey maps.

Key Concepts

Grid Lines

• Imaginary Lines: Divide maps into grid squares.
• Types of Grid Lines:
  • Eastings: Vertical lines, number increases moving east.
  • Northings: Horizontal lines, number increases moving north.

How Grid References Work

Basic Four-Figure Grid Reference

• Reading Procedure:
  1. Start with eastings (vertical lines) from the left.
  2. Next, read northings (horizontal lines).
• Example: For a yellow box, find first easting (e.g., 05), then first northing (e.g., 25).
  • Grid reference: 0525 (indicates a large area)

Precise Six-Figure Grid Reference

• Creating Subsections:
  • Divide grid squares into 10 equal parts both vertically and horizontally.
• Example:
  • Start with basic grid area (e.g., 0424), then subdivide.
  • Subdivide eastings: 047, northings: 046.
  • Precise grid reference: 047246

Working with Ordnance Survey Maps

Identifying Grid References on Maps

• Blue Lines: Represent eastings and northings.
• Example: To find the grid reference of a square:
  • Identify first easting (e.g., 87) and first northing (e.g., 26).
  • Grid reference: 8726

Finding Specific Locations

• Example: To locate a parking symbol:
  • Easting and northing for a precise location (e.g., 878263).

Important Considerations

Symbols and Real Locations

• Symbol Placement:
  • Symbols may not be placed at their exact location to avoid map clutter.
  • Use arrows or lines connecting symbols to their true location.
• Example: Caravan site symbol may appear in a different grid reference, check for arrows indicating real location.

Conclusion

• Reminder: Be cautious with symbol placements.
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Be sure to practice identifying both basic and precise grid references using different maps for a better understanding of their application in real-world scenarios.