Grab a Grid Reference...
Mono version HERE
Beds    VC30    AWSs    RNRs   

Checking tile count...
Lock zoom level of OS map  

Drag the red marker on the left map to where you want a National Grid reference*. (The blue marker on the right map cannot be dragged). The grid refs will appear on the right, and the corresponding boxes are drawn on both maps.
Please do not record using 2km, 5km or 10km grid refs. These are for information only.

On the left map press "Satellite" for aerial photos only, or "Map" for Google Maps only.
The Vice-counties, VC30 and Bedfordshire boundaries only show on the left map (at present...)

The right map shows Ordnance Survey maps of different scales according to the zoom amount.
Ordnance Survey limits the number of map tiles accessed per day, so the right map will stop working if this is reached.

The right map tracks the left map whenever it is zoomed, panned or the marker moves, but the right map can be can be zoomed and panned on its own.
If you've found the place you wanted using the right map, you can move the left map to it using the "Match Left Map to Right Map" button.
The "Get The Marker" button moves the marker to the centre of the left map, so match the maps first.

The "Go to ..." box can be used to go to a Grid reference (e.g. TL123456), or a postcode e.g. (MK41 9DJ), or a place name. (Currently it goes to the first matched place name, but a choice will eventually be offered - bear with me).

The "Toggle Vice-County" selector turns a Vice-County boundary on and 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).

The zoom level of the OS (right) map can be locked to its current level so that it doesn't change when the left map is zoomed. Just tick the box under the OS map. (The OS zoom can still be changed manually of course).

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.

A location, along with all the display options other than selected Vice-Counties, can be bookmarked using the Bookmark button. If using Firefox you'll probably want to untick the "Load this bookmark in the sidebar" option in the dialogue box that pops up, otherwise the bookmark will open in the sidebar.

The "mono" map version of this tool (Google maps only) 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)
Want to plot a set of records on Google Earth? Use our simple interface HERE
The Bedfordshire boundary and vice-county boundaries are subject to this Ordnance Survey OpenSpace End User Licence Agreement.

Special permission was sought and obtained from the NBN Trust to make the vice-county boundaries available on Google Maps. This has been granted for individual use and non-commercial purposes ONLY. We are required to say that digital VC boundaries were developed under contract and funded by Defra, Scottish Natural Heritage and the NBN Trust, and to display the following.

Digital Watsonian Vice-County Boundary Data

© All rights reserved. National Biodiversity Network Trust and Crown Copyright 2003, comes with ABSOLUTELY NO WARRANTY. This product is available for not-for-profit use to support biological activities strictly under licence with the NBN Trust.

Note to webmasters:

Basic instructions for including the code within a website have been provided HERE

The javascript in this application is released under the GNU General Public License Version 2.
Many thanks to Jonathan Stott for making his coordinate conversion code available!

I'm pleased to report this tool is being adopted by other webmasters and can also be found at:

Warwickshire Butterfly Conservation
Lothian Wildlife Information Centre
UK Butterflies
North East England Butterfly Conservation
Cambridgeshire and Essex Butterfly Conservation
Wokingham District Veteran Tree Survey
Biodiversity Information Service for Powys and Brecon Beacons National Park (BIS)
Dorset Butterflies
Gloucester Centre for Environmantal Records (GCER)
Somerset Environmental Records Centre (SERC)

Please email me (Keith Balmer) if you also adopt it...