![]() ![]() The accuracy will depend on your device and local conditions, and will generally improve if you remain still for a few moments. GPS works best with a clear view of the sky. The Survey Date Widget allows you to identify the PRONI references for each historic Ordnance Survey map on the application at a specific point. How accurate are the GPS features for OS Locate The location shown relies on information from the hardware in the phone/tablet. The Bookmark Widget allows you to name and store links to specific areas, so you can easily navigate to a specific point during future visits (using the same PC/ tablet). The Legend Widget details the meaning of the various outlines and symbols used in the Maps viewer. The Info Widget outlines the maps and datasets available on the PRONI Historical Maps viewer. These layers can be selected using the Layer List widget. The Swipe widget provides a vertical bar on your screen which can be dragged back and forth across the screen to compare one map layer with another. Enter a location search below to zoom to the approximate location. Layers include seven historical Ordnance Survey maps (covering the years 1832 - 1986) and a range of datasets (including county, townland and parish boundaries and sites, landmarks and buildings of historical interest). Instructions: Simply right click on the map to find a grid reference at that point. The Layer List widget shows each of the optional layers which can be switched on or off. Navigating using a map and a compass is a fantastic life skill and complements any GPS device. Learn what these are called and how to find a grid reference. The application defaults to the OSNI Basemap, which is generated using a range of OSNI map products such as 1:50,000 Vector and Largescale data. OS maps are covered in a series of blue grid lines that are used to pinpoint exact locations anywhere on a map. The Basemap Gallery widget allows you to choose from a selection of four basemaps. Ordnance Survey (OS) is Great Britain’s national mapping agency. The Help widget has a guide on how to use the PRONI Historical Maps viewer and a link to a PDF version of this guidance which can be downloaded for reference. Put this two‑figure number after your first one and you now have the four-figure grid reference, which looks like the example in diagram D: 6233.Help using the Historical Maps viewer: Help Widget Then use the northing to go up the stairs until you find the same corner. To find the number of a square first use the eastings to go along the corridor until you come to the bottom left-hand corner of the square you want. Grid references are easy if you can remember that you always have to go along the corridor before you go up the stairs. To start, a four-figure grid reference is a handy way of identifying any square on a map. If you haven't got OS Maps or OS Locate or you're using a paper map, it is easy to find a particular place using a grid reference. ![]() How do grid references help me find places? It also transforms GPS ellipsoid heights to orthometric. The grid is further divided into 1 kilometre intervals, as shown in diagram C. The Coordinate Transformation Tool transforms GNSS based ETRS89 latitude and longitude or cartesian XYZ coordinates to the equivalent OSGB36 National Grid eastings and northings, and vice-versa, using Ordnance Surveys National Grid Transformation OSTN15. On an OS Landranger map you can find the two main grid letters (in this case TL) on the legend or the corner squares of the map. ![]() Map grid showing 10km grid squares and TL63 ![]()
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