Topographic Wilderness Orienteering Triangulation
A challenging, hands-on discovery and STEM project designed for curious young minds aged 10 to 14.
Materials Needed
- • Local topographic contour map (paper format) (1 map)
- • Sighting mirror baseplate compass (with declination adjustment) (1 unit)
- • Clear plastic ruler and mechanical pencil (1 set)
Pro Tips
- → Locate two prominent landmarks visible in the distance that are also marked on your map (e.g., a water tower, mountain peak, or bridge).
- → Take a sighting compass bearing to landmark 1, convert from magnetic to grid North, and draw a back-bearing line from that landmark on the map.
- → Repeat for landmark 2: where the two back-bearing lines intersect marks your exact location on the map.
Safety First
Stay on designated trails while taking bearings; maintain awareness of terrain edges.
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Step-by-Step Instructions
Step 1
Orient the topographic map to magnetic North, checking the map margin for your local magnetic declination offset value.
Step 2
Sight landmark 1 through the compass mirror, record the degree azimuth, calculate the reverse back-bearing (+/- 180°), and draw the line from the landmark across the map.
Step 3
Sight landmark 2 at a wide angle from the first, calculate its reverse back-bearing, and draw the second line across the map.
Step 4
Identify your position at the intersection point, check surrounding terrain features, and verify your coordinates against GPS.