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🧠 Memory Aids: Map Skills Made Stick

Grid References: The CARTS Method

Use CARTS to remember the steps for a 6-figure grid reference:

C — Corridor first: Read along the bottom of the map (easting) before anything else

A — Always eastings before northings: Without exception — "along the corridor, then up the stairs"

R — Room number second: Read up the side of the map (northing) — like going up to your room after walking along the corridor

T — Tenths for 6-figure: Divide each km square into 10 equal strips to get the third and sixth digits

S — Six digits for a precise location: 6-figure = 6 digits = 100 m precision. 4-figure = 4 digits = 1 km square

Scale Shortcuts (Memorise These Two)

1:50,000 map → 2 cm = 1 km
1:25,000 map → 4 cm = 1 km

Check: 2 × 50,000 = 100,000 cm = 1 km. 4 × 25,000 = 100,000 cm = 1 km. Both correct.

Bearings: Never-Miss Compass Points

The four cardinal bearings are non-negotiable for exams:

N = 000° | E = 090° | S = 180° | W = 270°

Memory trick: Never Eat Shredded Wheat = N, E, S, W going clockwise. Add 045° for each diagonal: NE = 045°, SE = 135°, SW = 225°, NW = 315°.

Latitude vs Longitude

LAT = fLAT = horizontal lines that lie flat. They go across the globe (east–west) and are always listed first. Longitude lines are LONG — they run from pole to pole (tall, not flat), and come second.

Contour Spacing — The Slope Rule

Close together = steep (like rungs on a ladder that are squashed — hard to climb). Wide apart = gentle (like rungs on a ladder with lots of space — easy stroll).

Map Types — Weakness Quick Reference

Choropleth: hides variation WITHIN each shaded area
Dot map: cannot give exact figures
Proportional symbols: hard to compare circle sizes precisely
Isoline: difficult to read values between lines

Quick Check: On a 1:50,000 map, two settlements are 7.4 cm apart measured in a straight line. One is at an altitude of 60 m (from contours), the other at 110 m. Calculate (a) the real-world straight-line distance and (b) the gradient of the slope between them.

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