How to Take a Bearing with a Compass and Map

by Christopher O'Keeffe June 04, 2026

By Christopher O’Keeffe, Managing Director of Mapworld

There is a satisfying moment when a map begins to make sense in the landscape. The ridge in front of you matches the contours on the page. The track junction is where you expected it to be. And the compass gives you a direction you can explain, check and follow.

That is what learning to take a bearing offers. You can measure the direction from your position to a destination, carry that direction into the country around you, and use the map to judge what should happen along the way.

Using a fixed or zero-adjustment compass, place its edge from your start towards your destination on the topographic map. Align the housing’s orienting lines with grid north and read the grid bearing. Apply the correct local grid-to-magnetic conversion, set that magnetic bearing at the index, then turn yourself until the needle’s north end aligns with the orienting arrow. The direction-of-travel arrow now indicates the direction to sight along.

There are a few important details behind that short answer. The biggest is knowing which north you are using. This guide explains the complete process, using a conventional baseplate compass, with worked examples for Australian map users.

What is a compass bearing

A bearing describes a direction as an angle measured clockwise from a stated north reference. North is 000° or 360°, east is 090°, south is 180° and west is 270°. A bearing of 045° points north-east; 225° points south-west.

The number is only part of the information. 070° grid and 070° magnetic may point in different directions. Write the reference beside the number whenever you record or share a bearing.

A bearing also needs a starting point. The direction from one track junction to a hilltop will differ from the direction to that same hilltop from a campsite farther down the valley.

And direction does not include distance. “Walk on 070°” cannot tell you when you have arrived, whether there is a cliff ahead, or whether the land is accessible. Those answers come from the map, the terrain and your route plan.

Choose a suitable map and compass

For learning, use a baseplate compass with a transparent rectangular base, a rotating degree dial and clear orienting lines. Its straight edge lets you measure directions directly on the map. A small keyring compass may indicate north, but it usually lacks the features that make this process straightforward.

Choose a map that covers the whole route, including sensible alternatives. Check its scale, edition, legend, grid, north diagram and any reliability information. A newly printed copy can still contain older mapping.

At the stated print size:

These are scale calculations, not promises that every track or hazard will appear. The appropriate sheet depends on the terrain, available mapping and the detail your journey requires. If you enlarge or reduce a map, check its resulting scale before using the ruler scales on your compass.

Our guides to reading a topographic map, comparing common topographic scales and finding the correct map sheet will help you make that choice. You can also use our topographic map indexes and browse Australian topographic maps.

Know the parts before you turn the dial

The magnetic needle, the orienting arrow and the direction-of-travel arrow have different jobs. Learn to recognise each one on your own compass.

On many compasses the north end of the needle is red. Check the markings and instructions for your model. The familiar phrase “red in the shed” means aligning that end with the north end of the orienting arrow; it does not mean walking wherever the red needle points.

Understand the three north references

Before measuring anything, look at the map margin.

True north points towards the geographic North Pole. Grid north follows the map’s north–south grid lines. Magnetic north is the direction indicated by the north end of a freely moving compass needle, away from local interference.

The angle between true and magnetic north is magnetic declination, also called magnetic variation. The angle between grid and magnetic north is the grid–magnetic angle. The difference between true and grid north is grid convergence.

For the method below, you measure against the map’s grid, so the correction you need is the grid–magnetic angle for that map and location. Do not substitute a true-north declination value without accounting for grid convergence.

Check the printed north diagram, its reference date and the accompanying instructions. Use the stated angles rather than measuring the little diagram: its arrows may be spread apart for clarity. Geoscience Australia explains this in its topographic map specifications.

There is no single magnetic correction that works throughout Australia. The value changes with location and time. For an old map, obtain current information from the map publisher or an appropriate geomagnetic resource, such as Geoscience Australia’s magnetic-field information. Confirm whether the value supplied is relative to true north or grid north.

Orienteering maps need a separate check. Their north lines commonly represent magnetic north, so the grid-to-magnetic procedure used on a conventional topographic sheet may be unnecessary. Read the map’s notes and the organiser’s instructions. Our Orienteering Australia with SILVA guide introduces that setting.

How to take a bearing from a map

The following method uses manual correction: a compass with no mechanical declination adjustment, or one whose adjustment has been deliberately set to zero according to its manual. If yours is already adjusted, read the section on adjustable compasses before proceeding.

1 Confirm your starting point and choose the next destination

Identify where you are on the map using more than one clue where possible. A junction, nearby stream and slope shape together are more convincing than a single bend that merely looks familiar.

Choose a clear destination for the next leg. For early practice, use short distances and obvious features. Check what lies between the two points, estimate the distance and identify something you should recognise when you arrive.

If you cannot establish your starting position, do not give a guessed position the appearance of certainty by measuring a bearing from it.

2 Put the compass edge along the route

Place a long edge of the baseplate through the starting point and destination. The direction-of-travel arrow must point from the start towards the destination.

Keep the baseplate in that position. You can draw a light pencil line between the points to make alignment easier, provided that marking is suitable for the map surface.

3 Align the housing with grid north

Rotate the housing until its orienting lines are parallel with the map’s north–south grid lines. Make sure the housing’s north end points towards grid north, not south.

Keep the long baseplate edge on your route line. At this stage, ignore the magnetic needle. You are using the compass as an angle-measuring instrument. The paper does not have to be physically facing north for this measurement.

4 Read and record the grid bearing

Read the dial at the fixed index mark. Record the result with its reference, for example 070° grid.

Check the broad direction against the map. If the destination is north-east of your start but your reading is south-westerly, something has probably been reversed.

The map measurement is made from grid north. Keep the compass edge directed from A towards B and the housing’s north lines parallel with the map grid.

5 Convert the grid bearing to a magnetic bearing

Use the correct local grid–magnetic angle. Record the converted result, then turn the bezel until that magnetic bearing sits at the index mark.

Here is a deliberately hypothetical example:

Why subtract? In this example, magnetic north is already 10° clockwise from grid north. The clockwise angle remaining between magnetic north and your route is therefore 60°.

This 10° value is an example, not an Australian default. If magnetic north were instead 10° west of grid north, the same 070° grid route would require 080° magnetic. Reverse the operation when converting a magnetic observation back to the map grid.

Always identify which north the correction starts from. A true-to-magnetic value and a grid-to-magnetic value are not automatically interchangeable.

6 Turn yourself to face the bearing

Lift the compass off the map and hold it level in front of you, with the direction-of-travel arrow pointing away from your body. Keep the chosen bearing set on the bezel.

Turn your body and the compass together until the needle’s north end aligns with the north end of the orienting arrow. Allow the needle to settle. Look along the direction-of-travel arrow: that is your intended direction.

Move away from vehicles, steel structures, magnetic phone cases, speakers and other sources of interference before taking the reading. Keep phones and magnetic accessories away from the compass, and follow the manufacturer’s separation guidance.

7 Sight a landmark and check your progress

Choose a distinct, stationary feature on the bearing: a particular tree, rock or other feature you can reach safely. Walk to it while watching the ground and surroundings, then take the direction again for the next short section.

Keep comparing the journey with the map. Are you climbing when you expected to climb? Have you crossed the track or drainage line you anticipated? Does the distance travelled fit the next feature?

The bearing is one part of those checks. If the landscape stops matching the plan, stop and resolve the discrepancy before adding more distance to the problem.

If your compass has adjustable declination

A printed declination scale and a mechanical adjustment mechanism are different features. Check the manual for your exact model.

An adjustable compass can build a chosen north correction into its operation. When it is correctly configured for the same reference used on your map, you follow the manufacturer’s adjusted-compass method instead of applying the manual arithmetic again.

Do not combine the two methods. For example, if the compass already compensates correctly for the local grid-to-magnetic angle, subtracting that angle again introduces a new error.

A setting intended for true north is not automatically a grid-north setting. Check both the angle and the reference when moving to a new area or a different map. If you are learning, a clearly documented manual method is easier to audit than an adjustment whose setting you do not understand.

How to take a bearing to a visible landmark

Sometimes the direction starts with the landscape. You can see a hill or other distinct feature and want to measure its direction, identify it on the map, or use it to help establish your position.

Using the same fixed or zero-adjustment compass:

1. Hold the compass level and point the direction-of-travel arrow directly at the feature.
2. Keep the baseplate aimed at it while rotating the housing until the orienting arrow’s north end aligns with the needle’s north end.
3. Read the bearing at the index mark and record it as a magnetic bearing.
4. If you want to plot that direction on a grid map, convert it from magnetic to grid using the local grid–magnetic angle.

In our hypothetical 10° east example, a reading of 060° magnetic converts to 070° grid. If your own position is known, draw the 070° grid direction outwards from your position on the map and compare the features along that line with what you can see.

An adjustable compass may already display a corrected bearing. Establish what it is showing before doing any further conversion.

Back bearings and finding your position

A back bearing points in the opposite direction along the same line. Add 180° to a bearing below 180°, or subtract 180° from a bearing of 180° or more. Keep the north reference the same.

A back bearing can help check a leg you have just travelled. It does not automatically retrace your actual path after detours or drifting away from the original line.

Using known landmarks for resection

If your position is uncertain but you can confidently identify mapped landmarks, bearings can help estimate where you are. This is resection, often loosely called triangulation.

Take a bearing to the first known landmark and convert it to a grid bearing. Calculate the back bearing, then plot that line from the landmark back towards your possible position. Repeat with a second clearly identified landmark in a substantially different direction. Nearly parallel lines give a weak fix; well-separated directions are more useful.

The lines should cross near your position. A third observation helps check the result. Real readings contain errors, so three lines may form a small triangle rather than meeting exactly. Neither the triangle nor its centre guarantees your position: check the terrain and reconsider any doubtful landmark identification.

For resection, plot back from known landmarks. Convert every observation to the map’s north reference before comparing the lines.

Practise this technique with an instructor in familiar country before relying on it when your position is uncertain. It depends on recognising the correct features as much as it depends on reading the compass.

Following a bearing through Australian bush

Pause at identifiable features and compare the map with the landscape before beginning the next leg.

A ruler makes any route look straightforward. Real terrain adds steep slopes, water, thick vegetation, fences and access restrictions. Check current park advice, weather and closures before you leave, and choose a route appropriate to your skills and the conditions.

If an obstacle forces you sideways, simply resuming the original bearing from the far side creates a parallel route. It does not put you back on your original line. Relocate against a known feature and plan the next leg, or use an offset technique you have already learnt and practised.

Three useful ideas make a route easier to check:

• A handrail is a recognisable linear feature, such as a safe, permitted track, that helps you maintain your position as you travel.
• An attack point is a distinct feature close to a smaller destination, from which you take the final short leg.
• A catching feature is something recognisable beyond your target that tells you you have gone too far. Choose one that does not require entering hazardous ground to reach it.

For example, it may be easier to follow a formed track to an unmistakable junction, then navigate a short final leg, than to take a long bearing across a hillside. Our guide to Australian topographic map symbols helps you interpret the features that make those decisions possible.

Common mistakes and how to catch them

Small angular errors matter over longer legs. As a simple geometric illustration, walking 1 kilometre on a constant bearing 5° away from the intended direction produces about 87 metres of sideways error. That calculation assumes a straight course on a level plan; it is not a prediction of an individual walk. Short, checkable legs give you more opportunities to notice a mistake.

Choosing a compass for your needs

Start with readable markings, a useful straight edge and a needle that settles freely when held level. Then choose additional features according to the navigation you actually do.

The SILVA Field compass is a straightforward baseplate option to consider for learning and general outdoor use. The SILVA Expedition compass is an example of a more fully featured model. Check the exact current specifications and manual rather than assuming that every compass in a range has the same adjustment or sighting system.

For Australian use, check that the model is balanced for the appropriate magnetic zone or uses a suitable global needle system. Needle balance and declination correction solve different problems. A Southern Hemisphere compass can still require the correct local bearing conversion.

You can compare the current Mapworld compass collection. For schools, clubs and structured practice, our orienteering collection brings together relevant equipment.

Build the skill before you need it

A familiar park and a short, supervised exercise are useful places to learn what the compass is telling you.

Choose an open, familiar area where you have permission to practise. Pick two identifiable points a short distance apart, take a bearing to one and record it. Walk to it, then check the bearing back. Repeat until setting the dial and recognising the correct arrows feel unhurried.

Next, introduce a suitable map. Measure a route on paper, identify its north reference, make the required correction and compare the result with the visible destination. Keep the scale, distance and north-reference checks in the exercise rather than treating them as optional extras.

An orienteering club or navigation course gives you feedback that an article cannot. For group teaching, start with visible destinations and simple tasks before adding hidden controls or less obvious terrain.

Use paper and digital navigation together

A paper map helps you inspect the surrounding terrain and possible alternatives. A navigation device can supply another position check when it has a usable fix. Neither removes the need to understand what the information means.

Download and test offline mapping before travelling. Check the coordinate format, datum and grid zone when matching a digital position to a paper map. When comparing directions, confirm whether the device is displaying true, grid or magnetic bearings.

Carry suitable backup power and communication equipment for the journey, leave a route and return plan with someone responsible, and know when to turn around. If you become unsure of your position, stop in a safe place and assess the evidence rather than following a bearing from a guess.

For more on building complementary navigation habits, read GPS vs Paper Maps and What Happens in Australia if GPS Goes Down?.

Frequently asked questions

Can I take a bearing without a map

Yes. You can measure a magnetic bearing to a visible feature with a fixed or zero-adjustment compass. A map becomes important when you want to identify that feature, plan the route or relate the observation to your position.

Do I have to orient the map before measuring a bearing

No. For the map-measurement method described here, align the housing with the map’s correct north lines and ignore the magnetic needle. Orienting the map is still useful when comparing it with the surrounding landscape.

Do I always subtract declination in Australia

No. Use the local angle, its east or west direction and the north references involved. Map-to-compass and compass-to-map conversions run in opposite directions. Never apply a remembered national correction.

Why does my compass disagree with my phone

First check whether both are using the same north reference. Then move the compass away from the phone and magnetic accessories, hold it level and repeat the observation. A screen reading and a compass reading should not be assumed equivalent without those checks.

Does a Southern Hemisphere compass point south

No. The marked north end still indicates magnetic north. Hemisphere or zone balancing helps the needle move properly despite the magnetic field’s vertical component; it does not reverse the meaning of north or automatically correct declination.

Can I follow a bearing straight back to the start

A back bearing reverses a straight leg. If your route included bends, obstacles or sideways drift, it will not reproduce those movements. Use your recorded route, map and identifiable features to plan the return.

Which map should I buy for practising bearings

Choose a sheet that covers your practice area, shows useful identifiable features and provides clear scale and north-reference information. Begin with our topographic map collection, or read Best Maps of Australia if you are still deciding what type of map you need.

Find the right map and compass with Mapworld

Learning to take a bearing gives you a useful way to connect the page with the place. Start with short legs, check the north reference every time, and make a habit of looking up from the compass to read the country around you.

Explore our compasses and navigation accessories, choose the right topographic map, or browse orienteering equipment for your next practice session.

About the author: Christopher O’Keeffe is the Managing Director of Mapworld. His guides help readers understand maps and choose mapping and navigation equipment for the way they travel, learn and work.

Technical references and further learning

The numerical examples in this article are illustrative. Use the current information for your location and the instructions supplied with your own compass.

• Geoscience Australia — Map Reading Guide: background on map grids, compass use and bearing conversion. This is an older teaching reference, not a source of current local magnetic angles.
• Geoscience Australia — magnetic north diagrams in topographic maps: how north references and their angles are shown in map margins.
• Geoscience Australia — monitoring the Earth’s magnetic field: Australian geomagnetic modelling and changing magnetic conditions.
• Vicmap — map grids and magnetic information: grid north, convergence and magnetic information on Victorian mapping.
• SILVA — baseplate compass manual: compass components, operating methods, adjustments and magnetic interference.
• Suunto — understanding balancing zones: why needle balancing differs from declination correction.
• SILVA — choosing a compass: manufacturer guidance on compass types and uses.

Share:

---

Leave a comment

Comments will be approved before showing up.

Name *

Email *

Comment *

---

Also in Map Guides, Travel Tips & Reviews