Ordnance Survey is the national mapping agency for Great Britain. It's our job to define exactly where every important 'thing' is in England, Scotland and Wales. We keep it all up to date, from new roads and buildings to shifting coasts and rural change, so that our map data can be relied on by everyone from supermarkets and sat nav providers to local councils and the emergency services. It's all a long way from 200 years ago, when we started mapping the coast ready to repel an expected French invasion; which is where the military tag 'Ordnance' comes from.

We also make maps for walkers and you will have met those Landranger and Explorer maps in your geography lessons, or maybe at Scouts, or as part of the Duke of Edinburgh Award scheme. And our maps are on many websites too (like this one). So as you are already expert map readers you are ready for some map Missions.