OS Open Zoomstack is now available as a fully supported open data product. Thanks to the 1200 people who took part in our trial and gave us feedback and helped bring this product to life.
What is OS Open Zoomstack?
A comprehensive vector basemap of Great Britain, it’s fast and easy to use and takes you from national to local in one scroll of the mouse or pinch of the screen. It’s highly customisable and can be used in apps, on websites and even offline. Available as one file (in two different formats) our latest open data offering comes with styles, a simple data schema and guides to get you started.
Built around 1852, this precision timepiece on the wall at OS HQ has intrigued many of us here. According to the accompanying plaque, this Dent Master Chronometer was the standard on which all other mobile chronometers owned by OS were checked against before being used in the field astronomical observations by surveyors. An accurate knowledge of time is necessary in the calculation of latitude and longitude.