Reading Contour Lines on Topographic Maps
How contour spacing, index lines, and landform shapes translate the ground into a printed surface you can plan against.
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Outdoor Navigation
Read the land, then read the map.
Working notes on orienteering, topographic map reading, and compass navigation, written with Canadian terrain in mind: boreal forest cover, lake-dense routes, and long sightlines across the Shield.
What these notes cover
Three fundamentals that hold up in the field
Each topic stays close to what actually happens between two control points: relating contour shapes to the slope underfoot, holding a bearing past an obstacle, and choosing a line that the ground will let you walk.
Contour interpretation
Reading spacing, re-entrants, spurs, and index contours so the printed surface matches the rise and fall you feel through your boots.
Compass technique
Setting and following a bearing with a baseplate compass, accounting for magnetic declination, and using aiming-off and attack points.
Route choice
Weighing the straight line against handrails, catching features, and the cost of dense cover or wet ground before committing to a leg.
Reference notes
Field articles
Using a Baseplate Compass for Field Bearings
Taking a map bearing, adjusting for declination, and walking it accurately past trees, water, and broken ground.
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Planning a Route Across Backcountry Terrain
Breaking a leg into segments, picking handrails and attack points, and judging when the direct line is the slow line.
Read the noteHow a leg reads in the field
From plan to control
A single orienteering leg moves through recognisable stages. The pills below borrow the staged labels from the site's design system to mark each step from orientation to confirmation at the control.
Orient map
Read terrain
Set bearing
Follow line
At control
leg: north spur to lake inlet
1 orient map to north
2 identify index contour 300 m
3 bearing 042 deg, +14 deg declination
4 handrail: stream on left
5 attack point: boulder cluster
6 control: re-entrant, east side
Contact
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Questions about a technique described here, or a correction to the reference material? Use the form and include enough detail to locate the section.
Email: editor@talmiexex.org
Mailing: 250 University Ave, Toronto, ON, Canada