The purpose of TdhTrails is to report location relative to a defined network (geofencing) using coordinates obtained from the mobile device on which the app is running. Networks used by TdhTrails are defined within an sqlite database that may be created, viewed and edited using the TdhGISnet personal computer software. Coordinates used by the network may be longitude/latitude or any coordinates that can be obtained by converting from long/lat data using the Project4 library. A typical use of Td