Download 3x3 minute Grid Conversion Program (By Gareth Hazell)

Grid references

Although it is still important for all of us to focus on the protected areas in our 100km region, we are introducing an extra angle to the challenge for 2003.

We would like to expand the collection of information to other regions and work towards an online atlas system for all the serious birders to benefit from.

The new listing program make provision for this by allowing the observer to enter the atlas grid for each list submitted, and to add additional information for the area. If you are not sure of the grid reference, rather leave it blank and give a good description of where the area is.

The observer can also expand the bird list to a national list for the whole of Southern Africa. This will allow all observers to submit list from other destination that they travel to.

The grid reference that will apply works on the same basis as the reference used during the atlas project. We hope to include a mapping system to the listing program in the near future to ensure the accuracy of the grid references submitted.

Here is some indication on how to determine the grid reference to use:

Each degree square is designated by a 4-figure number made up of the values of the Latitude and Longitude (in that order) at its NW corner.

Each degree square is divided into four 30' x 30' squares.
These are lettered A B C D as indicated in the sketch.

Each 30' x 30' square is sub-divided into four 15' x 15' grids.
These are lettered A B C D as indicated in the sketch.
In the sketch, the red area indicates the coverage of the quarter degree grid 2830CA.
This is the maximum size grid reference that should be used. It is also the same area as one 1:50000 scale map.

If a finer grid is required the only alternative is a 3' X 3' grid. The following scetch illustrate the numbering format for an example grid if devided into 3' X 3' grids.

The blue coloured grid will be notated as grid 2830CA19