Compass Navigation: Bearings, Declination & Route Finding | Survival Solutions

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Navigation & Field Mapmaking
Field principle
A compass is a direction tool, not a position finder. Combine it with a map, terrain, distance and checkpoints to avoid confidently walking the wrong route.
Quick visual reference. Read the explanations and limitations before use.
On this page
1. Identify the compass parts
2. Take a bearing to a landmark
3. Convert magnetic and true bearings
4. Orient a map and measure direction
5. Avoid common errors
Reference 1 of 5
Identify the compass parts
Baseplate:
Clear edge and direction-of-travel arrow align a map route with the compass.
Rotating bezel:
Degree ring for reading and setting a bearing, usually 0–360 degrees clockwise.
Magnetic needle:
The north-seeking end points toward magnetic north when the compass is level and clear of interference.
Orienting lines:
Parallel lines inside the bezel that align with map grid north lines.
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Reference 2 of 5
Take a bearing to a landmark
1. Aim:
Hold the compass level, direction-of-travel arrow aimed at a distant distinct landmark.
2. Set:
Rotate the bezel until its orienting arrow aligns under the north-seeking needle.
3. Read:
Read degrees at the direction-of-travel index, not at the needle tip.
4. Travel:
Choose a close intermediate landmark along that bearing and walk to it; repeat the check.
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Reference 3 of 5
Convert magnetic and true bearings
Know the datum:
True north, magnetic north and map grid north differ. Read the map legend and its north arrows.
Use the current declination:
When east is positive and west negative: TRUE bearing = MAGNETIC bearing + declination; normalize 0–359 degrees.
Example:
A 70° magnetic bearing at +4° east declination becomes approximately 74° true. A 70° magnetic bearing at −4° west becomes 66° true.
Reverse:
Magnetic bearing = true bearing − declination. Do not correct twice when using an already-adjusted declination compass.
Check location/date:
Declination varies with location and time; older printed map values can be wrong.
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Reference 4 of 5
Orient a map and measure direction
Find the north reference:
Read map north, grid north, scale and contour interval; use matching north references consistently.
Align the map:
Place compass on the map, adjust for declination, and rotate map and compass until the needle aligns with the orienting arrow.
Set a course:
Join your current known point to a destination; place baseplate edge along the course and rotate bezel until its north lines parallel the map grid.
Cross-check:
Compare expected terrain features, path junctions and crossings. Do not follow a bearing blindly across hazards.
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Reference 5 of 5
Avoid common errors
Metal and electronics:
Move away from vehicles, steel structures, magnets, phones and electrical equipment while taking a reading.
Reverse-bearing confusion:
A back bearing is 180° opposite the forward bearing (add or subtract 180°). Check before retracing.
Lost position:
Stop, shelter if necessary, identify last known location, retrace only when safe, and use emergency communications if in danger.
Practice first:
Test on a known route in daylight, using more than one visible checkpoint.
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Further reading & source material
Use these sources to validate local rules, technical standards and updates. No emergency article replaces official alerts or trained responders.
NOAA — Magnetic declination and bearings
USGS — Orient a map with a compass
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