When you quote the six-figure grid reference you should put the letter of the area you are in before the numbers. Write this two-figure number down. These can be a useful guide where there aren't many contour height numbers. This gives: 31_25_ (Note: 3125 is the four-figure grid reference of the square). Sometimes it is necessary to be even more accurate. Grid Square T. The bottom left of each lettered square starts at 0 and goes to 100 in each direction. Then estimate in tenths from grid line to point. Latitude refers to the north-south position of a point and longitude refers to the east-west position. Grids on maps serve a different function, they help to tell you, where on a map you are located. Jungle 200m, Ash River 100m, Kursk 400m, Kuban 170m, Karelia 130m You might have noticed by now that OS maps are covered in a series of blue grid lines. They are scaled down from life size and include symbols to show particular features and landmarks. So with the grid reference TQ303782, TQ indicates the 100 sq km of Britain designated by Ordnance Survey’s National Grid as ‘TQ’… To find out what features the different symbols represent, for example buildings, different kinds of church, electricity pylons, roads and railways, woods, orchards, scrub or marsh and so on, consult the key shown on the map. You can see this in diagram B. In the above diagram, we have taken the lower right square from the previous diagram and divided it by 10 in each direction. Quote the Northings. It is a more universal and accurate way of referencing a point on the earth’s surface, used by satellites and GPS machines. of Communications, Energy and Natural Resources. Quote the eastings. of Agriculture, Food and Marine, GIS and Dept. When taking a grid reference, always read left to right along the bottom or top of the map first and then bottom to top along the side of the map. Footpaths and bridleways are marked as green dashes on OS Explorer maps and magenta on OS Landranger maps. Maps are made at different scales for different purposes. To make it even easier, the grid lines are exactly 4cm apart, so every square is 1km by 1km. Now imagine this square is divided up into 100 tiny squares with 10 squares along each side. We use cookies to make your browsing experience better. X (Easting) Y (Northing) Go. Every fifth contour line is printed more thickly than the others. Contours are lines connecting points of equal height above sea level that show the relief of the land. The complete grid reference you should give to correctly identify Lugnaquillia would be “T 032 918”. That could be because you have injured you ankle while out and about and you need help, or perhaps you found an interesting antiquity and you want to share that with a friend. By using our site you agree to our use of cookies. Take the numbers on the edge of the map for these two sides (downstroke of the ‘L’ first, as you would write it). Using this system you can identify a 10 kilometre grid square. This website uses cookies to improve your experience. On a 1:50 000 map, 1cm on the map represents 500 metres on the ground. Location (Road , Town) Go. Estimate the number of tenths (100m) the church lies from the two sides, once again starting with the downstroke. Locate the grid line immediately left of the point, read the large figures labelling the line either on the top or bottom of the margin of the map. This quick and easy guide explains how to read a simple grid reference and explains the basics for beginners. A Discovery series map will also give you centre of sheet coordinates in Irish Transverse Mercator (ITM) which is a newly derived GPS compatible mapping projection that is associated with the European Terrestrial Reference System 1989 (ETRS89). Identify letter for 100,000 metre grid square in which the point is located. If you want to precise in your grid reference, in your mind, roughly divide each side of the grid reference box into 10. On a 1:25 000 map, such as an OS Explorer, one unit of length on the map represents 25,000 units on the ground. Enter a location search below. Here is the scale displayed on our Discovery series map. On OS Explorer maps, the interval between contours is five metres in lowland areas and 10 metres where mountainous. 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. Scales help us work out distance to our destination and therefore how long it will take us to get there. On OS maps, these squares are further divided into smaller squares by grid lines representing 10 kilometre spacing, each numbered from 0 to 9 from the south west corner, in an easterly (left to right) and northerly (upwards) direction. An easy way to remember this is to keep in mind the letters HV (High Voltage), that is horizontal reading first followed the vertical reading. Go. Go. The first three specify the vertical lines (the eastings) and the second three the horizontal (the northings). OSGB Co-Ordinates X = Eastings Y = Northings example :-X = 492983 Y = 188837. In the diagram below, the number 4 is in square 28 across (on the horizontal) and square 54 up (on the vertical) and therefore, the four-figure grid reference is ‘2854’. The vertical lines are called 'eastings', as they increase in value as you travel east on the map. For example, the above image shows TL63. Bonus: Other ways to measure map distance. Ireland is covered by the National Grid, that is the country is divided into 25 squares from A to Z (the letter i is not used). For example, the grid reference of the 100 m square containing the summit of Ben Nevis is NN 166 712. Do remember that, although a good map will remain useful for at least a few years, the landscape is ever-changing and you should not be surprised if some features on the ground do not agree with your map. The grid is further divided into 1 kilometre intervals, as shown in diagram C. It is easy to find a particular place using a grid reference. Locate the grid line immediately below the point, read the large figures labelling the line either on the top or bottom of the margin of the map. Maps are simply an accurate picture of the ground as seen from above. As we already said, when giving a four-figure grid reference, always give the eastings number first and the northings number second. Check out our Pathfinder guide titled Navigation Skills for Walkers including map reading, compass and GPS. Identify the 1km square containing the church. they are all different sizes, if you're referring to ground forces. The red circle has a 6 figure grid reference of 257522. To measure the approximate distance of your route, take a piece of thin string and lay it carefully along the exact route on the map, then lay it straight along the scale line on the map’s margin. Eastings 032. So 1cm on the map represents 25,000cm or 250 metres on the ground. Sometimes four-figure grid references are used to give a rough location that covers the map grid square, not a specific point within it. The smaller the area a map covers, the larger the scale is. These are linked to the National Grid which provides a unique reference system, and can be applied to all OS maps of Great Britain, at all scales. Grid line 91 estimation 8. In this case, the tourist information office is in grid square 4733. (In some cases, squares adjacent to a Grid Zone Junction (GZJ) are clipped, so polygon is a better descriptor of these areas.) If going diagonally the distance across the grid square is about 1½km. Linked Data and Semantic Web Technologies, GIS and Dept. The 1:25 000 scale map is very useful for walking, but if you use it in a car you will quickly drive off the edge! Northing 918. i remember a link from a while ago that had every map, including some of the newer ones, but i'm terrible at digging. Still remembering to go along the corridor and up the stairs, work out the extra numbers you need and put them into your four-figure grid reference like this in diagram E: 625 333. 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. Each incremental square measures 1,000 metres on the ground. After the letters you can quote the eastings (6) first, then the northings (3). Some map markings do not show up on the ground, such as council boundaries, contours and grid lines. A grid reference uses six figures to identify a particular spot on a map that is 100 metres square. It is important to note that the National Grid reference is not related to longitude and latitude, even though these references are marked on the edges of our maps. You can also work out distances on a map using a romer or map measurer. Now you know how to read a map, why not find a walking route near you to walk? Every map will carry a scale, not just the value of say 1:50,000, but also a depiction of that scale. When giving directions you can provide even more accuracy to your grid reference by stating a nearby landmark or feature. The smaller the area a map covers, the larger the scale is. (Grid references may be written with or without spaces; e.g., also NN166712.) A quick way of estimating distance is to count each square you cross in a straight line. Scales help us work out distance to our destination and therefore how long it will take us to get there. When the term 'grid square' is used, it can refer to a square with a side length of 10 km (6 mi), 1 km, 100 m (328 ft), 10 m or 1 m, depending on the precision of the coordinates provided. With practice, you’ll soon learn to estimate the distances involved by eye, but don’t forget the extra effort of climbing hills when calculating how long the route will take to walk. If you want to pinpoint an more exact place on a map, such as your own house, you will need to use a six-figure grid reference. Grid Reference. Lat Long. Let us know how you've got on in the comments below. To start, a four-figure grid reference is a handy way of identifying any square on a map. Now an extra figure must be added to each pair of numbers to specify to the nearest 100m where the church lies within the square. Instructions: Find a grid reference on the Google map by simply right-clicking on the map. These grid lines help you to pinpoint an exact location anywhere on the map.
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