Read full details on how to read grid references. TF73G - identifies tetrad G within 10-km square TF73 TF722336 - identifies a point to the nearest 100 m H64 - identifies a 10-km square in Ireland (occasionally written as IH64) TF73 - identifies a 10-km square in Britain All British grid references should begin with two letters, those in Ireland starting with one letter, and followed by a series of numbers (and/or the tetrad code). A correct grid reference does not include the map sheet number. Note: Use the numbers on the bottom of the map first (the eastings), then the numbers up the side (the northings) to make the sheet reference. Go to Menu : Weather Places to Visit Introduction to Cumbria If you have found Visit Cumbria’s Lake District Maps page useful please help to support us by booking your accommodation though our pages. Reading grid referencesĬorrectly reading grid references is crucial for many BTO surveys. The reference for the grey 10km square shown is SP47. Wikipedia National Grid reference System Ordnance Survey web site. A transparent overlay for the Landranger maps showing a 10-km square and tetrads was available on request during the Atlas survey period. Four figure grid reference - square selected. Type in a placename or postcode and a 2-letter, 6-digit grid reference will display eg. In Ireland the Ordnance Survey of Ireland Discovery Series (1:50,000) maps are most useful. Four figure grid references locate a grid square (usually 1 km square) on a map. List of 6, 25 and 5 London editions with index maps To determine the grid reference for the map you require use the county indexes available in the Maps Reading Room or go to the Get-a map service on the the Ordnance Survey website. Ordnance Survey Landranger maps (1:50,000) or Ordnance Survey Explorer maps (1:25,000) are perfect for this purpose. Part of the fun of Atlas projects is poring over maps, deciding on the best route to take you past this pond, or that promising-looking wood. We strongly recommended you got an up-to-date map of the area you proposed to survey. Read more detail on giving complete grid references. A tetrad is then given its full reference as the 10-km square code followed by the tetrad letter (e.g. The National Mapping Agreement which was launched in January 2017 providing Government Departments and Public Sector Bodies with unrestricted access to most of Ordnance Survey Ireland’s (OSi) geospatial data. There are 25 tetrads within each 10-km square and these are labelled A to Z, excluding O (to avoid confusion with zero), from bottom left (SW) to top right (NE). MapGenie and the National Mapping Agreement. A tetrad (from the Greek tetras meaning four) on the other hand is a collection of four 1-km squares arranged into a 2 km by 2 km square. A 10-km square as its name suggests is a square 10 km by 10 km. OS grid references are always given with the number along the bottom of the. There are various scales of resolution, but for the Atlas we worked with 10-km squares and tetrads. All OS maps are overlaid with blue grid lines which divide the map into 1 km. Like many bird surveys the Atlas used the Ordnance Survey National Grid as a means of identifying locations of bird records.
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