| Number of digits |
How will it look? |
Area Covered |
When to use? |
| 2 figure |
SN62 |
10 kilometre square |
Not used very often, but perhaps to locate a town? |
| 4 figure |
SN6222 |
1 kilometre square |
To locate a large landscape feature such as a park |
| 6 figure |
SN628223 |
100 metre square |
To locate a field that contains a number of archaeological monuments |
| 8 figure |
SN62882235 |
10 metre square |
To record the location of a particular building of interest where an address is not available |
| 10 figure |
SN6288722359 |
1 metre square |
To record the location of a find, or single monument |
| 12 figure |
SN628870223590 |
10 centimetre square |
These are the most precise and are used in archaeology to record specific features, a GPS device is generally used to generate this level of precision. |
