Navigation

Navigate by dead reckoning

Dead reckoning estimates your position by combining your known starting point with the bearing and distance of each leg you travel. You use it when landmarks are scarce or visibility is poor and you cannot obtain a reliable position fix. Record each leg, then draw those legs to scale on your map to estimate where you are. Error accumulates, so confirm and reset your position at every positively identified feature you reach, such as a mapped river crossing or trail junction.

Navigation 15 min practice Intermediate You can use this technique in open country, forest, or low visibility wherever you can safely follow a compass bearing and estimate distance. Steep slopes, thick vegetation, and frequent detours make distance estimates and heading control less reliable.

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Topic summary

Key takeaways

Your log contains a confirmed start and an ordered bearing-and-distance entry for every leg.
You can transfer each bearing to the map correctly and draw every leg to scale from the preceding endpoint.
Your plotted endpoint is close to an independently checked location in the practice area.
You mark uncertain estimates honestly and restart your plot from each positively identified mapped feature.
Avoid: Starting from an assumed location makes every later position doubtful; positively identify and mark your starting point before moving.
Avoid: Mixing magnetic and grid bearings rotates your plotted route; label your bearings and apply the correct conversion when transferring them to the map.

Intended uses

Navigation skill (Intermediate, ~15 min practice)
Requires: Baseplate compass with a straight edge, Topographic map with a coordinate grid, scale, and declination information, Pencil, Pace-count beads or a mechanical counter

Climate suitability

You can use this technique in open country, forest, or low visibility wherever you can safely follow a compass bearing and estimate distance. Steep slopes, thick vegetation, and frequent detours make distance estimates and heading control less reliable.

Safety: Never follow a bearing blindly across cliffs, unsafe water, or other hazards; choose a safe route and record its separate legs. Before setting out, identify a clear stopping boundary and a safe fallback route, and stop to reassess if you cannot account for your travel.

Required tools

Baseplate compass with a straight edge
Topographic map with a coordinate grid, scale, and declination information
Pencil
Pace-count beads or a mechanical counter

Required materials

Notebook pages for the leg log
Spare paper for plotting and practice

Step-by-step

Note your start point exactly — grid coordinate, prominent landmark, or known location.
Why: An exact, positively identified start anchors every later estimate; an uncertain start shifts the entire plotted route. Mark it on the map and record its coordinate or an unambiguous description.
Record the bearing you're traveling on with a compass — write it down, don't trust memory.
Why: Writing down the bearing prevents memory errors and gives you a reference for checking your direction while walking. Label it as magnetic or grid and use the map's applicable declination information to convert correctly between compass and map bearings.
Track distance by pace count or estimated time × speed as you move.
Why: Distance gives each bearing a usable leg length rather than just a direction. Use a pace count calibrated over a known distance on similar terrain, or multiply moving time by a realistic speed, allowing for slope, footing, and load.
Whenever you change bearing, log the new heading and reset your distance count.
Why: Logging every heading change preserves the shape of your route, including detours around obstacles. Record the completed leg's distance before resetting the count or timer for the next leg.
At any point, you can plot the current estimated position on the map by drawing each leg in sequence from the start.
Why: Plotting the legs in order reconstructs your travel, with each new leg starting at the previous leg's endpoint. Use the map scale and consistent grid bearings, and treat the final point as an estimate rather than a confirmed fix.

Tip: Dead reckoning accumulates error. Confirm and reset your position at every known feature (a river crossing, trail junction, distinct peak) you pass.

Common mistakes

Starting from an assumed location makes every later position doubtful; positively identify and mark your starting point before moving.
Mixing magnetic and grid bearings rotates your plotted route; label your bearings and apply the correct conversion when transferring them to the map.
Changing between single steps and double paces corrupts distance measurements; choose one convention, such as counting each left-foot landing, and use it consistently.
Using a level-ground pace calibration on rough or sloping terrain distorts distance; recalibrate on similar ground where possible and allow greater uncertainty elsewhere.
Counting an obstacle detour as straight-line progress misplaces your endpoint; record the detour as separate bearing-and-distance legs.

Troubleshooting

If you lose your pace count, then stop and mark the distance as uncertain rather than inventing a precise total; return along a safe, known route to a confirmed point if necessary.
If compass readings seem inconsistent, then move away from metal objects and electronics, hold the compass level, and check again.
If your plotted position conflicts with the terrain, then stop and check your start point, bearing conversions, map scale, and leg entries before proceeding.
If you reach a positively identified mapped feature, then replace your estimated position with that confirmed fix and begin a fresh sequence of legs.

Field practice drill

Spend about 15 minutes in a safe, open practice area with mapped features. Calibrate your pace count over a measured distance, then start at a confirmed point and travel two or three short legs, recording each bearing and distance before changing direction. Plot your endpoint before checking it against a known feature or an independent measurement; compare the difference and repeat, focusing on consistent pacing and accurate heading changes.

Indicators of success

Your log contains a confirmed start and an ordered bearing-and-distance entry for every leg.
You can transfer each bearing to the map correctly and draw every leg to scale from the preceding endpoint.
Your plotted endpoint is close to an independently checked location in the practice area.
You mark uncertain estimates honestly and restart your plot from each positively identified mapped feature.

Related outdoor skills

Educational reference only. Wilderness conditions change fast — practice in low-stakes settings, take a certified wilderness first-aid course, and confirm regional regulations before you rely on any of these skills in the field.