![]() Since you multiply and then divide to convert to km, you can simplify your maths into a single smaller calculation:ġ: 25 000 - quarter the cm to calculate kmĪs doing these without a calculator can occasionally be tricky, it's a good idea to be able to do an approximation.įor the 1: 25 000 map, the scale also reads '4cm to 1km'. Now, you need to multiply that distance by the map scale, and convert that to meters or kilometres.ġ: 8.5cm measured on a 1: 25 000 OS Explorer mapĢ: 12.8cm measured on a 1: 50 000 OS Landranger map If you used a bit of string, measure the string to get a distance in cm. Measure your distance using a ruler or string as above. If you have your handy ruler you can still calculate distance. You might be using a map with no printed scale, or you've folded your map up into the map case and can't get to it easily. Sometimes you can't just compare to a printed map scale. ![]() Place the string on your map and then measure the string against the scale Step 3: Calculating distance from the scale Once you have covered the route, carefully mark the string (or just hold it in the right place) and compare it to your map scale. You may need to use some extra fingers to pin it in place. Try using the lanyard from your compass or a spare shoelace if you don't have a handy bit of string in your pocket. While you could take lots of small measurements and add them up, there's an easier way using just a bit of plain old string. This does have one big drawback - you can only measure straight lines, which are not that common outside cities. However, if you use the technique above, you can use almost anything - your pencil, fingers or a twig - to get a distance and compare it to the map scale. You can measure straight line distances on a map with a ruler - there's often one included on the side of your compass. When you measure a distance on the map, just compare it to the scale, and it will instantly tell you the real world distance.Įxample of a scale from an OS Explorer 1: 25 000 map Step 2: Measuring the distance ![]() If you understand the map scale number that's great, but if you find that tricky you can still measure distances accurately.Īt the bottom of each map there's a scale that indicates the distance on the map. ![]() Browse paper maps Step 1: Find your scaleįirst of all, you have to know your scale. ![]()
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