10 Figure Grid Reference
The Grid References section of a TREC POR at Level 2A and above uses 8 figure grid refs. 10 figure and 12 figure grid references are also possibilities, though on a larger scale map. Here's how the letters are arrived at OS starts with a big square, divided into 5 equal rows and 5 equal columns. The letters A to Z
Six-figure grid references In your head, you should be able to divide all sides of the square into ten equal sections. By doing this, you can pinpoint locations within the square - these are called sixfigure grid references. A00191_1116 52 51 50 16 17 18 17,51 52 51 50
3. Diving into Four-Figure Grid References. The concept of four-figure grid references emerges as a fundamental skill. But what exactly is a four-figure grid reference? At its core, a four-figure grid reference is a method used to specify the location of a particular grid cell on a map.
OS Grid References are based on 100km grid squares identified by letter-pairs, followed by digits which identify a sub-square within the grid square, as explained on the OS Interactive Guide to the National Grid. 6-digit references identify 100m grid squares 8 digits identify 10m grid squares, and 10 digits identify 1m squares. TG51401317
Since, in the UK at least, a 6-figure grid reference identifies a square of 100-metre sides, an 8-figure reference would identify a 10-metre square, and a 10-digit reference a 1-metre square. In order to give a standard 6-figure grid reference from a 10-figure GPS readout, the 4th, 5th, 9th and 10th digits must be omitted, so it is important
8 figure SP82555255 10 metre square 10 figure SP8255552555 1 metre square 12 figure SP825555525555 10 centimetre square If you take your finds for recording with a Finds Liaison Officer, grid references taken to a precision of 8 - 10 figures are the most useful. It is also beneficial to view maps together with your FLO and
WGS84 Co-Ordinates example -Lat 53.870659 Long-1.200235 or Lat 53.870659N Long1.200235W
First find the four-figure grid reference for the square and write it down with a space after each set of numbers, like this 62_ 33_ Now imagine this square is divided up into 100 tiny squares with 10 squares along each side. Still remembering to go along the corridor and up the stairs, work out the extra numbers you need and put them into
eight-figure grid reference, such as '1926 4548', indicates a 10 m by 10 m square on the map and ten-figure grid reference, such as '19267 45487', indicates a 1 m by 1 m square on the map In practice, it's the six-digit grid reference number that is most commonly used, although the more digits used gives you a more precise location
6-figure grid references give a more precise location within each grid square by breaking the square down further into tenths. To help visualise this, imagine that each grid square is actually a smaller 1010 grid. The extra two numbers in your 6-figure grid reference are indicating how many tenths along the easting and northing you should count.
