Map Scales and Symbols

Active learning helps students grasp abstract concepts like scale and symbols by making them tangible. Working with real Ordnance Survey maps turns reading and measuring into hands-on tasks, which builds confidence and spatial reasoning better than passive worksheets or textbook explanations.

• 1st Year
• Exploring Our World: Junior Cycle Geography
• 3 activities
• 25 min–50 min

Learning Objectives

1. Compare and contrast ratio, linear, and verbal map scales, explaining the mathematical relationship between them.
2. Analyze the purpose of a map legend and explain how specific symbols represent geographical features.
3. Calculate straight-line and curved distances on an Ordnance Survey map using the provided scale.
4. Classify different map scales based on their suitability for various geographical investigations, such as local area surveys versus national overviews.

Inquiry Circle

⏱ 45 min·Pairs

Inquiry Circle: The OS Treasure Hunt

Students are given a list of 6-figure grid references for a specific map. Each reference leads to a 'clue' (a symbol or feature). They must work in pairs to find all the clues and solve a final geographical puzzle.

Prepare & details

Differentiate between ratio, linear, and verbal map scales.

Facilitation Tip: During the OS Treasure Hunt, assign mixed-ability pairs so students can teach each other how to decode grid references and symbols.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Simulation Game

⏱ 50 min·Small Groups

Simulation Game: 3D Contour Modeling

Using playdough or stacked cardboard, groups build a 3D hill and then 'slice' it to create their own contour map. They then swap maps with another group to see if they can identify the steepest and flattest parts.

Prepare & details

Explain how to use a map legend to interpret symbols.

Facilitation Tip: For the 3D Contour Modeling activity, provide clay or playdough in small batches so students can focus on contour intervals rather than material management.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Think-Pair-Share

⏱ 25 min·Pairs

Think-Pair-Share: Route Planning

Students are given a starting point and a destination on a map. They must plan the 'easiest' route for a hiker, discussing with a partner why they chose to avoid certain steep contours or marshy symbols.

Prepare & details

Analyze why different map scales are used for different purposes.

Facilitation Tip: During the Route Planning think-pair-share, circulate with a timer to keep pairs focused on justifying their route choices using map evidence.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Teaching This Topic

Start with concrete examples before abstract rules. Teach scale by having students measure a real 1km walkway on the playground using a trundle wheel, then compare it to the same distance on a 1:50,000 map. Avoid overwhelming students with too many symbol types at once. Focus on the 20 most common OS symbols first, then gradually introduce less frequent ones. Research shows that students retain spatial skills better when they create their own maps rather than just reading provided ones.

What to Expect

Students will confidently use grid references, interpret map symbols, and calculate real-world distances from scaled measurements. They should explain how contour spacing shows slope and justify their choice of map scale for different scenarios.

Watch Out for These Misconceptions

Common Misconception

During the 3D Contour Modeling activity, watch for students who assume wider contour spacing means steeper slopes. Redirect them to physically feel the slope with their hands between closer and wider spaced contour layers.

What to Teach Instead

Have students run their fingers along the clay contours at table level, then lift their hand to show how the slope angle increases when contour lines are closer together.

Common Misconception

During the OS Treasure Hunt activity, watch for students who assume the top of every map is always North. Redirect them to use the compass rose on their map to confirm orientation.

What to Teach Instead

Provide small compasses and ask students to physically rotate their maps until the compass needle aligns with the map's north arrow before starting the hunt.

Assessment Ideas

Quick Check

After the OS Treasure Hunt, provide each student with a different OS map extract featuring at least three key symbols. Ask them to identify each symbol and explain its meaning using the legend.

Exit Ticket

After the Route Planning activity, students complete a quick card with one example of where a 1:50,000 map would be most useful and one example for a 1:10,000 map, with brief reasoning for each choice.

Discussion Prompt

During the 3D Contour Modeling wrap-up, pose the question, 'How might hikers use contour information differently from cyclists?' Facilitate a class discussion connecting contour interpretation to real-world navigation needs.

Extensions & Scaffolding

• Challenge early finishers to plan a 5km hike using a 1:25,000 map, including elevation gain calculations and potential hazards.
• Scaffolding: Provide a partially completed grid reference grid on tracing paper for students who struggle with six-figure references.
• Deeper exploration: Have students compare the same location on both 1:50,000 and 1:10,000 OS maps, then present how different scales change what they can see and show.

Key Vocabulary

Map Scale	The ratio between a distance on a map and the corresponding distance on the ground. It shows how much the real world has been reduced to fit on the map.
Ratio Scale	A map scale expressed as a ratio, such as 1:50,000, meaning one unit on the map represents 50,000 of the same units on the ground.
Linear Scale	A scale shown as a line marked with distances, allowing direct measurement of distances on the map using a ruler.
Verbal Scale	A map scale stated in words, for example, 'One centimetre represents one kilometre'.
Map Legend	A key that explains the meaning of the symbols, colours, and patterns used on a map.