Anyone going to the field to collect data and GPS location should really investigate the capabilities of Esri's Survey123 app for iPhone and Android.  I took a Geotechnical Gauge used by geologists to characterize soil samples and created a form that collects all the same data using your smart device.  Everything is in a dropdown list format (no typing).  The preceding selection determines your next choice (i.e. if you start by selecting a grain category of gravel, the next question asks the gravel type and eliminates the option to choose something from a fine grain category).  Additionally the app allows you to include a photo or other attachment, and you collect the GPS location of the soil sample!!  GEOTECHNICAL NERDS UNITE!!!