Drag the red marker on the map to where you want a National Grid reference*, The grid refs will appear on the right, and the corresponding boxes are drawn on the map.
Please do not record wildlife using 2km, 5km or 10km grid refs as they are too vague. These are for information only.

On the map press "Satellite" for aerial photos only, or "Map" for Google Maps only.
The "Get The Marker" button moves the marker to the centre of the map.

Bookmarking:
Append "?gr=XXXXXX" to the GAGR web address, replacing XXXXXX with your desired gridref, e.g. https://www.bnhs.co.uk/2019/technology/grabagridref/monogagr.php?gr=TL123456 will go to TL123456, then use your browser's normal bookmarking method to remember it for future use. (Remember to actually "go to" each newly created web-address containing a new gridref otherwise your browser will just bookmark the previous address again).

The "Go to ..." box can be used to go to a Grid reference (e.g. TL123456).

The "Toggle Vice-County" selector turns a Vice-County boundary on or off each time that county is selected. NOTE: It takes a while to download to your PC the large files defining some VCs, so you may see a significant delay before a boundary appears - please be patient. Multiple VCs can be displayed. If you want to clear all the VCs, select the second option "Clear Vice-Counties". Clicking on a boundary will tell you which VC it is.

GAGR fits to the browser's window size when started. If you subsequently change the browser window size you can re-fit GAGR to it using the "Fit to Window" button (top-left).

Accessible Wildlife Site (AWS) and Roadside Nature Reserve (RNR) boundaries courtesy of the BRMC which maintains them. Note that these boundaries are intentionally only approximate and should NOT be treated as definitive site boundaries.

You can add layer(s) contained in a KML or KMZ file to the left hand map (e.g. if you want to show your own site boundaries or to display some mapped information). Enter a web address for a KML or KMZ file into the text box next to the "Add KML/KMZ" checkbox, then tick the box to add the layers to the left map. Try pasting https://www.bnhs.co.uk/2019/technology/google_earth/maponge/ExampleDataset.kmz into the text box to see an example produced using our Map Your Records tool. (The example will show squares and markers in the central Bedfordshire area).

The "Duo" map version of this tool can be accessed HERE if you prefer it.

* as defined on Page 35 of A Guide to Coordinate Systems in Great Britain
(Although the National Grid covers a portion of Ireland Irish grid references are usually given using a different system. Irish grid refs can be obtained here)