Exploring Our World: Global Connections and Local Landscapes · 5th Year

Active learning ideas

Six-Figure Grid References, Bearings, and Coordinate Systems on OS Maps

Active learning works well for this topic because students need to physically interact with maps to build confidence in reading six-figure grid references and taking bearings. Irish OS maps provide real-world contexts that make coordinate systems meaningful beyond theory. Movement and collaboration during activities help students visualize spatial relationships that static images cannot convey.

• NCCA Curriculum Specifications
• NCCA: Primary - Maps, Globes and Graphical Skills
• NCCA: Primary - Using Pictures, Maps and Globes

• 25–40 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Experiential Learning
• 35 min · Pairs

Grid Reference Hunt: OS Map Features

Distribute OS Ireland map excerpts marked with six-figure references. Pairs locate and photograph 8-10 features, describe their characteristics, and create their own reference list for classmates to find. Conclude with a class share-out of discoveries.

Apply six-figure Irish Grid reference notation to precisely locate and describe geographical features on 1:50,000 OS Ireland maps, and explain the practical significance of coordinate precision for emergency services dispatch, field archaeology recording, and environmental monitoring site documentation.

Facilitation Tip

During Grid Reference Hunt, have students mark their starting points on the map so they can see how small errors compound when adding eastings and northings.

What to look for

Provide students with a 1:50,000 OS map of a local area. Ask them to identify a specific landmark (e.g., a church spire, a crossroads) and write down its six-figure grid reference. Then, ask them to calculate the bearing from that landmark to another feature on the map.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 02

• Experiential Learning
• 40 min · Small Groups

Bearing Relay: Compass Navigation

Mark a schoolyard course with 5 flags representing map points. Small groups use compasses to take magnetic bearings from one flag to the next, adjust for local declination, and record on worksheets. Groups verify paths against teacher-provided OS map.

Calculate straight-line and route distances using map scale ratios, determine magnetic bearings between specified locations, and assess how magnetic declination and the divergence between grid north and true north affect navigational accuracy in field conditions.

Facilitation Tip

For Bearing Relay, place compasses at stations so students rotate roles and practice adjusting for magnetic declination using the map's declination diagram.

What to look for

Pose the question: 'Imagine you are a park ranger needing to report a fallen tree blocking a trail. Which is more critical for your report: a four-figure grid reference or a six-figure grid reference, and why?' Facilitate a discussion comparing the precision needed for different scenarios.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 03

• Experiential Learning
• 30 min · Small Groups

Scale Measurement Challenge: Distances

Provide OS maps with paired landmarks. Small groups measure straight-line and route distances using rulers and scale bars, convert to real-world units, and compare results. Discuss errors from terrain or projection.

Evaluate the positional accuracy limitations of paper-map coordinate systems relative to GPS/GNSS satellite positioning, and assess the implications of varying precision requirements for precision agriculture, flood inundation modelling, and infrastructure planning applications in Ireland.

Facilitation Tip

In Scale Measurement Challenge, provide string and rulers so students physically measure curved paths before converting to kilometers.

What to look for

On an exit ticket, have students write two sentences explaining the difference between grid north and magnetic north, and one sentence describing a situation where understanding this difference is important for navigation.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 04

• Experiential Learning
• 25 min · Pairs

Map vs GPS: Coordinate Check

Pairs use free OS Ireland apps or GPS devices to locate school-area sites, note coordinates, and compare to printed OS map grid refs. Record differences and implications for fieldwork accuracy.

Apply six-figure Irish Grid reference notation to precisely locate and describe geographical features on 1:50,000 OS Ireland maps, and explain the practical significance of coordinate precision for emergency services dispatch, field archaeology recording, and environmental monitoring site documentation.

Facilitation Tip

With Map vs GPS, assign pairs one device and one map so they must reconcile differences in coordinates before reporting findings.

What to look for

Provide students with a 1:50,000 OS map of a local area. Ask them to identify a specific landmark (e.g., a church spire, a crossroads) and write down its six-figure grid reference. Then, ask them to calculate the bearing from that landmark to another feature on the map.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

A few notes on teaching this unit

Teachers should begin with concrete examples from local Irish OS maps before moving to abstract concepts like projections. Avoid starting with the Irish Grid system's mathematical basis, as students need spatial intuition first. Research shows that students grasp bearings better when they measure angles directly with compasses rather than calculating from coordinates. Emphasize the practical consequences of declination in Ireland, where magnetic north shifts significantly over time.

Successful learning looks like students confidently plotting six-figure grid references within 100 square meters, accurately measuring bearings to within two degrees, and explaining why coordinates matter for Irish applications. They should also justify which coordinate system suits different real-world tasks. Peer discussions and quick checks reveal gaps before misconceptions take hold.

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Watch Out for These Misconceptions

• During Grid Reference Hunt, watch for students confusing six-figure grid references with latitude and longitude.

  Pause the hunt and have students trace the Irish Grid lines on their map, then compare them to the lat/long grid at the edges. Ask them to plot the same feature using both systems to highlight the differences in projection and units.

• During Bearing Relay, watch for students assuming bearings always measure from true north.

  Have teams check their bearings by comparing the compass reading to the map's grid north arrow. Ask them to measure both grid and magnetic bearings to the same object and note the difference before adjusting.

• During Map vs GPS, watch for students assuming paper maps match GPS coordinates exactly.

  Ask pairs to record the same feature's coordinates from both sources, then calculate the difference in meters. Discuss how scale, generalization, and projection affect accuracy in real-world applications like flood modeling.

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Methods used in this brief

• Experiential Learning