PLog utilizes digital technology to the fullest extent in order to provide an efficient, consistent and reliable field data collection system. Specifically, PLog facilitates recording subsurface exploration data using customized, form-based software for Palm OS handheld computers. The handheld application consists of smart forms that aid the field engineer in logging data reliably, accurately and efficiently. Within the software, text input is minimized using buttons, lists and checkboxes that provide a comprehensive set of choices for the user to select and information browsers to verify and modify the input data