Coordinates/Grid references

Spot-checks 1, 6 and end of site grid reference/co-ordinates

In the UK, using a GPS, it is essential to record a 10 figure NGR (National Ordnance Survey Grid Reference for the UK) for spot-checks 1 and 6 (the mid-point) or a combination of latitude and longitude in your preferred format that provides a 1m accurracy; a reminder to do so is given in the spot-check columns on page 2 of the form. The grid reference for spot-check 1 is required to ensure re-surveys start at the same locations as the original surveys. The grid reference for spot-check 6 is required to calculate distance from source, site gradient and other map-derived data. It is also essential to record a grid reference for 50m beyond spot-check 10 (where the site ends). Use 1:10,000 or 1:25,000 scale maps to provide a cross-check for the grid references and whenever possible annotate the site boundaries on a 1:25,000 scale map.

Alternatively, record latitude and longitude. If there is no GPS signal, or only a poor one, enter an 8-figure reference from a 1:25,000 scale map.