The Gilbert 21 Project
Personal Biological Recording Software
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The Gilbert 21 program and database are provided 'as is' without any guarantees or warranty. The author is not responsible for any damage or losses of any kind caused by the use or misuse of the program or database. The author is under no obligation to provide support, service, corrections, or upgrades.

Twany Owl by Stephen Pardue
Tawny Owl © Stephen Pardue

You need the software and a database to begin. You don't have to have a GPS voice data logger to use Gilbert 21 - it can be used to enter and manage biological records without one.

Download the latest software: Gilbert 21 version 3

Version 3 of Gilbert 21 requires version 4,0 of the .NET framework. If you need to install that, it can be obtained here:

.NET framework version 4.0.

Gilbert 21 can give you a lot of help by matching grid references to location names. To make use of that feature, you should download and import some place name (gazetteer) files before you start.

Gilbert 21 can select records based on the boundary of an area described in a boundary file. You can create your own but some particularly useful boundary files are available for download.

Evernote users who are having difficulty playing AMR sound files in Gilbert 21, can download the the relevant ffplay.exe utility from the links below, unzip to a convenient folder and set the path to the file on the options dialog.

Gilbert will then use ffplay to play these files, rather than the default program associated with the AMR file extension on the computer.

You can also download a sample of the files that are produced by the Visiontac VGPS-900 voice data logger to see how Gilbert 21 works with them.

To learn how to get started quickly with Gilbert 21, see the quickstart instructions.

G21 Android app
G21 app

For the download and install instructions for the Android app, goto the G21App page.

Other software

Google Earth is a great tool to help you get the most out of Gilbert 21. This free GIS software allows Gilbert 21 to display records spatially. (Note that you don't need the Google browser - Chrome.)

SQLite Studio is free software which allows you explore and manage SQLite database files. You don't need this in order to use Gilbert 21, but it may be of interest to those who want to look under the bonnet of the database.

Previous versions of Gilbert 21

Version 1 (superseded)

Version 2 (superseded)