GeoFIELD is a data management system that is designed to facilitate practical data entry and the production of geologic maps while in the field. GeoFIELD writes data to a Microsoft Access 2000 database and allows digitizing and plotting of station locations and structural data in an AutoCAD Map 2000 drawing using a Visual Basic for Applications interface. GeoFIELD provides a user-friendly interface within a familiar Windows environment. Its extensive picklists are easily customizable and ensure consistency and quality control during data entry. The widespread availability and easy customization features of Microsoft Access make GeoFIELD a flexible application that can be adapted to varying needs. In addition, Microsoft Access provides the ability to easily build complex database queries and generate reports. GeoFIELD can also be used successfully with a handheld device as well as with common GIS applications such as ArcGIS 8.x.