Geography · Year 6 · Mapping the World: Precision and Perspective · Autumn Term

Applying Six-Figure Grid References

Students will learn to use and interpret six-figure grid references for highly precise location identification on OS maps.

• National Curriculum Attainment Targets
• KS2: Geography - Geographical Skills and Fieldwork
• KS2: Geography - Map Skills

About This Topic

Six-figure grid references allow precise location on Ordnance Survey maps, identifying spots within a 100-metre square. Students locate the base four-figure grid square by following eastings along vertical lines first, then northings along horizontal lines. They refine precision by adding a tenth along each line for the extra digits, such as 123456 meaning three-tenths east and five-tenths north from the grid intersection.

This topic aligns with KS2 Geography standards on map skills and fieldwork. Students compare precision to four-figure references, design routes with sequences of references, and assess applications in safety or planning, like search and rescue. It develops spatial awareness, accuracy, and practical navigation for real-world use.

Active learning benefits this topic greatly. Hands-on map work, partner plotting, and outdoor hunts make coordinates concrete. Students gain confidence through trial and error on physical maps, collaborate to verify routes, and connect skills to fieldwork, ensuring deeper understanding and retention.

Key Questions

1. Analyze how six-figure grid references offer greater precision than four-figure ones.
2. Design a route using a series of six-figure grid references.
3. Evaluate scenarios where six-figure grid references are essential for safety or planning.

Learning Objectives

• Calculate the precise six-figure grid reference for a given feature on an Ordnance Survey map.
• Compare the precision of six-figure grid references against four-figure grid references for locating specific points.
• Design a walking route by sequencing at least five six-figure grid references.
• Evaluate the importance of six-figure grid references in scenarios such as mountain rescue or land surveying.

Before You Start

Introduction to Ordnance Survey Maps

Why: Students need familiarity with the purpose and basic features of OS maps before learning to use specific grid references.

Identifying Features on Maps

Why: The ability to recognize and name common symbols and features on a map is necessary to locate them using grid references.

Four-Figure Grid References

Why: Understanding how to use four-figure grid references provides a foundational skill for the more precise six-figure system.

Key Vocabulary

Six-figure grid reference	A system of coordinates used on maps to identify a specific location with high precision, pinpointing a 100-meter square.
Eastings	The vertical grid lines on a map, numbered from west to east. The first two digits of a six-figure grid reference represent the easting.
Northings	The horizontal grid lines on a map, numbered from south to north. The middle two digits of a six-figure grid reference represent the northing.
Grid intersection	The point where a specific easting line and a specific northing line cross on a map, forming the corner of a grid square.

Watch Out for These Misconceptions

Common Misconception

Eastings come after northings in the reference.

What to Teach Instead

Grid references always state eastings first, then northings, matching 'along the corridor, then up the stairs.' Active pair plotting on maps helps students practice the sequence repeatedly, with immediate peer feedback correcting reversals during route following.

Common Misconception

The extra digits count whole squares instead of tenths.

What to Teach Instead

Six-figure precision uses tenths of a grid square for eastings and northings. Hands-on estimation with rulers on maps during hunts builds this skill, as students physically measure and adjust, turning vague ideas into accurate habits.

Common Misconception

All locations in one grid square share the same reference.

What to Teach Instead

Each 100m spot needs unique refinement digits. Group relays expose this through plotting errors, prompting discussions where students refine together and see why precision matters for navigation tasks.

Active Learning Ideas

Orienteering Hunt: Grid Reference Challenge

Distribute OS map excerpts with six-figure clues to hidden schoolyard markers. Small groups navigate using compasses, record locations, and return to plot all points on a master map. Debrief with group shares of challenges faced.

45 min·Small Groups

Pairs Route Planner: Expedition Design

Pairs select a local area map and design a 1km hiking route using six six-figure references. They swap routes with another pair, follow them precisely, and note any errors. Discuss improvements as a class.

35 min·Pairs

Relay Race: Grid Plotting Teams

Divide class into teams with a large OS map. Teacher calls a six-figure reference; one student per team plots it, tags next teammate. First team to complete a teacher-set route wins. Review accuracy together.

30 min·Small Groups

Individual Annotation: Mystery Locations

Give each student a blank OS map grid overlay. Provide 10 six-figure coordinates for landmarks; students mark and label them. Peer check and teacher feedback highlight common refinements.

25 min·Individual

Real-World Connections

• Mountain rescue teams use six-figure grid references extensively to pinpoint the exact location of a casualty or incident in challenging terrain, ensuring rapid and accurate deployment of resources.
• Land surveyors and construction engineers rely on precise grid references to mark boundaries, plan building sites, and ensure accurate placement of infrastructure like roads and pipelines.
• Geocaching enthusiasts use six-figure grid references as the primary method for hiding and finding virtual or physical 'caches' hidden in outdoor locations.

Assessment Ideas

Quick Check

Provide students with a large-scale Ordnance Survey map. Ask them to locate and write down the six-figure grid reference for three specific features (e.g., a trig point, a church, a specific bridge). Check their answers for accuracy.

Exit Ticket

On an exit ticket, ask students to explain in their own words why a six-figure grid reference is more precise than a four-figure one. Then, give them a simple route (e.g., A to B to C) and ask them to write down the six-figure grid references for each point.

Discussion Prompt

Pose a scenario: 'Imagine you are lost in a forest and can only communicate by radio. Your friend knows your approximate location but needs your exact coordinates. Why is a six-figure grid reference vital in this situation?' Facilitate a brief class discussion on their responses.

Frequently Asked Questions

What is the difference between four-figure and six-figure grid references?

Four-figure references locate a 1km square using whole eastings and northings. Six-figure add tenths for a 100m square, like 123456 versus 1234. This precision suits fieldwork; teach by overlaying grids on maps so students see the refinement visually and practice plotting both types side-by-side.

How can active learning help students master six-figure grid references?

Active approaches like orienteering hunts and relay plotting engage students kinesthetically with OS maps. They navigate real spaces, estimate tenths hands-on, and collaborate to verify routes, reducing errors from passive reading. Movement reinforces eastings-northings order, while group debriefs address misconceptions, leading to confident, retained skills for fieldwork.

Why are six-figure grid references important in Year 6 geography?

They meet KS2 standards for precise map skills, enabling route design and safety evaluations. Students apply them to scenarios like emergency planning, building spatial reasoning for lifelong navigation. Connect to local OS maps for relevance, showing uses in hiking or urban searches.

How do you teach reading six-figure grid references on OS maps?

Start with eastings vertically, northings horizontally, then tenths. Use annotated maps for modeling, followed by guided practice. Progress to independent hunts; provide coordinate cards and compasses. Assess via route journals where students explain their steps, ensuring they grasp the full process.