What does a scale of 1 25000 on an OS map mean?
The basics On a 1:25 000 map, such as an OS Explorer, one unit of length on the map represents 25,000 units on the ground. So 1cm on the map represents 25,000cm or 250 metres on the ground.
Can you view Ordnance Survey maps online free?
OS OpenData provides free digital maps of Great Britain, available for any purpose.
How accurate is a 1 25000 map?
A map scale correctly reduces the actual distance on the ground to a corresponding distance on a map. The first number is the unit on the map and the second number is the distance in real life of the same unit so 1: 25,000 means that 1cm on the map corresponds to 25,000 cm on the ground.
How big is a grid square on a 1 25000?
Grid Squares: 1 blue grid square (4cm) represents 1 kilometre, which takes 15 minutes to walk and almost no time to drive. Amount of Detail: A 1:25,000 map will give you enough detail to do walking, running and off-road cycling plus micro and night navigation.
What does a red triangle on a map mean?
These red triangles are height difference indicators. They are always associated with another marker on the minimap, as you can see with the herb marker. Pointing down, it means the associated marker is below your current height (e.g. underground), vice-versa for upwards pointing triangles.
Is there a free Ordnance Survey app?
Getting started and logging in. OS Maps is available in both a web version and an app which is available on the Google Play Store for Android and The App Store for Apple iOS (iPhone and iPad) devices. Using both the app and web is recommended for the best experience.
Is there a free OS map app?
OS Maps. The free, registered version provides access to Britain-wide basic mapping, plus the ability to create, print and share routes with other users.
How does Ordnance Survey work?
Ordnance Survey (OS) is the national mapping agency for Great Britain. Paper maps for walkers represent only 5% of OS’ annual revenue. They produce digital map data, online route planning and sharing services and mobile apps, plus many other location-based products for business, government and consumers.
Is Ordnance Survey accurate?
A measured land survey at a scale of 1:200 should be accurate to + / – 5 cm. The Ordnance Survey at 1:1250 scale in an urban or defined rural town quote +/- 40cm. In rural areas this accuracy level falls to +/- 1.2m.
What was the first series of Ordnance Survey maps?
The 1:25,000 ‘Provisional edition’ or ‘First Series’, was Ordnance Survey’s first civilian map series at this medium scale, the forerunner of the modern Explorer and Outdoor Leisure maps. By 1956 it covered 80% of Great Britain, everywhere apart from the Scottish Highlands and Islands.
Is it possible to copy the Ordnance Survey symbols?
Ordnance Survey have told us that although the symbols are copyright they allow them to be copied without charge or specific licence. Click on a photo thumbnail to see a page with a larger photo, and other photo details. The photo page also has a section of the 1:50,000 Ordnance Survey map.
What was the scale of the Roy survey?
The Roy Military Survey map of Scotland is at a similar scale of 1:36,000, and the 1:20,000 scale was used in the First World War for artillery purposes on the Western Front and in selected areas of Great Britain ( GSGS 2748 ).
Where to find land features in OS 25k?
Some “land features” on the key to 50K symbols appear in other sections of the 25K symbols key – for example woodland, National Trust properties. Some abbreviations are in the OS key to symbols.