... OS grid numbers are far more brain-friendly -- they are easily found by going to this map: http://osmaps.ordnancesurvey.co.uk Next Templot needs to know how much area of map you want. That is specified in the equivalent model size, so it's important to have set your gauge/scale before doing this: 2_222110_340000000.png Templot then does some quite complex maths (maps are flat, the Earth's surface is curved), and loads all the necessary OSM tiles as background picture shapes. This is Shrewsbury in EM: 2_222110_350000004.png© OpenStreetMap contributors which might take a minute or two to load. As you can see, there could be several hundred picture shape tiles to fill the required area. But because each one is only a few KB, Templot can zoom and pan over them very quickly -- I have tried up to 2000 picture shape tiles without any noticeable effect on zoom and pan speeds. That certainly wouldn't be the case if this was a single large captured screenshot of several dozen MB. The BGS shapes file can be saved in ...