What happens if your phone dies halfway up a hill?
Most beginners have never thought about it. After 15 years as an outdoor instructor, that’s the moment I see again and again. A walker standing in mist, staring at a blank screen, with no backup plan and no idea how to navigate without GPS.
Learning how to use a compass on a map changes all of that. These tools don’t need signal or battery. They work in cloud, rain, and poor visibility. And once you understand the process, navigation skills for beginners really aren’t complicated. It just looks that way until someone breaks it down.
That’s what we’re going to do here.
Start With the Right Map
Before you touch the compass, you need the right map in your hands.
In the UK, that means an Ordnance Survey (OS) Explorer map at a 1:25,000 scale. At this scale, 4 centimetres on the map equals 1 kilometre on the ground.
Why does that matter? Because at 1:25,000, you get proper detail. Field boundaries, every contour line, and the green dashed lines that mark public rights of way. It’s the level of detail you need to navigate safely on foot.
Don’t use a road atlas or a tourist leaflet. They’re designed for driving, not for map reading for beginners on the hills. On any upland route, detail is the difference between knowing where you are and guessing.
Reading the Map’s Grid System
Right, before you pick up the compass, we need to make sense of those faint blue lines crossing your OS map. They’re part of the National Grid, and they’re your best friend once you know how to read them.
Eastings are the vertical lines. The numbers increase as you move east.
Northings are the horizontal lines. The numbers increase as you move north.
To give a grid reference, you always read eastings first, then northings. The classic memory trick: along the corridor, then up the stairs.
A 6-figure grid reference pins your location to a 100-metre square on the map. If you ever need to call Mountain Rescue, that’s the first thing they’ll ask for. Worth knowing before you need it.
Getting to Know Your Compass
It might look complicated at first, but a baseplate compass has only five parts you need to know.
The baseplate is the clear plastic body. You place it flat on the map.
The direction of travel arrow is at the top of the baseplate. It points the way you want to go.
The rotating bezel is the circular dial marked 0 to 360 degrees. You turn this to set your bearing.
The orienting lines and arrow are printed inside the bottom of the rotating housing. These line up with the grid lines on your map.
The magnetic needle spins inside the housing. The red end always points to Magnetic North. That’s how to use a compass to find north, and it’s the foundation of every other technique.
So, once those five parts click, how to use a compass for hiking becomes a lot more straightforward. Everything you do with a compass comes back to these basics.
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Setting Your Map — The Habit That Changes Everything
Here’s something I tell every beginner I work with: before you do anything else, set your map.
Setting the map means turning it so the features on the map match the features in front of you. If you skip this step, you risk walking 180 degrees in the wrong direction. I’ve seen it happen, even to experienced walkers who got complacent.
Here’s how:
- Hold your map flat in front of you.
- Place your compass flat on the map.
- Turn your whole body, map and compass together, until the red end of the needle points toward the top of the map, aligning with the vertical grid lines.
That’s it. Now what’s in front of you on the map matches what’s in front of you on the ground. A hill on your left on the map is a hill on your left in real life.
Do this every time you stop to check the map. Make it automatic.
Magnetic Declination — Why Your Compass and Your Map Don’t Quite Agree
Here’s a detail a lot of beginners miss, and in the UK currently its not big enough to matter for most people, but important to understant.
The top of your OS map shows Grid North, which aligns with the vertical grid lines. Your compass needle points to Magnetic North, which is in a slightly different location. The gap between them is called magnetic declination (or magnetic variation).
In the UK, magnetic declination is currently a small number of degrees west of Grid North. The exact figure shifts gradually over the years, and it’s printed in the legend of your OS map. You can also check the current figure for your area using the British Geological Survey magnetic declination calculator.
Why does it matter? If you take a bearing from the map and walk it without adjusting for declination, you’ll drift off course. Over a short distance on clear ground, the effect is small. On a longer leg across a featureless hillside in cloud, it adds up.
Check the figure on your map legend and adjust your bezel before you start walking.
How to Take a Bearing — Step by Step
This is the skill that lets you navigate in poor visibility, across featureless terrain, or when the footpath disappears entirely. Get this right and you can navigate without GPS on any route.
- Line it up. Place the edge of your compass baseplate on the map, connecting your current position to your destination. Make sure the direction of travel arrow points toward where you want to go, not back the way you came.
- Turn the dial. Rotate the bezel until the orienting lines inside the housing run parallel to the north-south grid lines on your map. The north marker on the bezel should point to the top of the map.
- Adjust for declination. Add or subtract the magnetic variation figure from the bearing on the bezel.
- Box the needle. Take the compass off the map, hold it flat in front of your chest, and turn your whole body until the red needle sits inside the orienting arrow. You’ll often hear this called “red in the shed.”
- Walk. Follow the direction of travel arrow. That’s your line of travel.
Practise this in a park or somewhere familiar before you rely on it on the hills. You want the steps to feel automatic before you’re standing in mist at 800 metres.
Frequently Asked Questions
What is the difference between Grid North and Magnetic North?
Grid North is the direction the vertical lines on your OS map point. Magnetic North is where your compass needle actually points. They’re slightly different. In the UK, Magnetic North sits a few degrees west of Grid North. The gap is called magnetic declination. When you take a bearing from a map and use your compass to walk it, you need to account for this difference, otherwise your bearing will be slightly off. How much it matters depends on the distance you’re travelling and how featureless the terrain is.
Do I need to adjust for magnetic declination in the UK?
Technically yes, but by such a small amount that is it not much worth it. In the UK in 2026, the figure is roughly 1 to 2 degrees west, depending on your location. For a short leg on clear ground, the effect is minimal. On longer distances across open, featureless terrain in low visibility, it adds up. Get into the habit of checking the current figure in your map legend and adjusting your bezel every time you take a bearing.
Can I use my phone compass instead of a baseplate compass?
You can in a pinch, but it’s not reliable as your main navigation tool on the hills. Phones lose battery quickly in the cold, and touchscreens stop responding in rain or with wet gloves. You also can’t place a phone edge against a map to take a bearing the way you can with a baseplate compass. A decent baseplate compass costs £15 to £30 and will outlast a dozen phones. Chuck one in your rucksack and leave it there.
How long does it take to learn map and compass navigation?
The basics, setting a map and taking a bearing, can be understood in an afternoon. Getting confident with them takes a few practice sessions on familiar ground. The key is to practise somewhere you know well before relying on these skills in poor weather or on unfamiliar terrain. Most walkers find that after three or four outings where they deliberately navigate by map and compass, it starts to feel natural.
Map and compass skills take an afternoon to learn and a lifetime to trust. The more you practise in familiar terrain first, the more automatic it becomes when you genuinely need it.
Once you’re comfortable with a compass, the next skill to build is reading contour lines. That’s where the map really comes alive. Our guide to reading contour lines on an OS map shows you how to read the shape of the land before you’ve even left home.
If you want a full, structured programme covering every navigation skill — from grid references to navigating in poor conditions — the Bondringo [Mountain Navigation Course] walks you through it step by step. It’s designed for exactly this point in your walking journey, when you want to move beyond following a GPS and start genuinely reading the ground.
Have a go at taking a bearing on a map at home, even from your front door to a local landmark. Try it a few times until the steps feel automatic. Ask any questions in the comments below.
