Measuring Distance on OS Maps

Key Concept

• Grid Square Distance: Any distance across a grid square on an OS map is always 1 kilometer. This holds true regardless of the apparent size of the grid square.

Measuring Straight Line Distance (As the Crow Flies)

1. Identify the two points (e.g., between two pubs).
2. Use a piece of paper:
   • Align the paper from one point directly to the other.
   • Mark the start and end points on the paper.
3. Measure the marked distance using the map's scale:
   • Example: If the distance is marked as 1.9 kilometers on the scale.

Measuring Driving Distance (Following the Road)

1. Use the same piece of paper:
   • Follow the road on the map by aligning the edge of the paper with the path.
   • Use a pencil to hold and adjust the paper at bends or corners.
2. Align the paper continuously:
   • At each turn or bend, adjust the paper to maintain alignment with the road.
   • Pay extra attention at large turns or corners for more precision.
3. Measure the total path:
   • Once the entire path is marked, use the map's scale to measure the distance.
   • Example: The total measured driving distance is 2.55 kilometers.

Summary

• Direct Flight Distance: 1.9 kilometers
• Driving Distance: 2.55 kilometers

Understanding both methods allows for an accurate representation of distance whether calculating direct travel or following pathways like roads.