### Title: An Open-Source Hardware GPS Data Logger for Wildlife Radio-Telemetry Studies: a Case Study Using Eastern Box Turtles Authors: **Patrick W. Cain** School of Science and Technology, Georgia Gwinnett College, Lawrenceville, GA USA Conservation Department, Toledo Zoological Society, P.O. Box 140130, Toledo, OH USA **Matthew D. Cross** Conservation Department, Toledo Zoological Society, P.O. Box 140130, Toledo, OH USA Contact email: pcain1@ggc.edu Abstract: Global Positioning System (GPS) telemetry technology has been a boon to animal spatial ecology studies. Oftentimes, the main limitation to wide-spread application of this technology is the cost, which can dictate the number of individuals outfitted with GPS technology, thereby limiting sample sizes. Here, we discuss the development a low-cost, customizable, open-source hardware GPS logger for use in animal movement studies. We also present results from field tests with eastern box turtles (*Terrapene carolina*) in northwestern Ohio. These GPS loggers have the potential to augment existing projects and facilitate studies that would be otherwise cost-prohibitive. *** The link to bitbucket seems to keep breaking down, so here's a [link](https://bitbucket.org/Splat01/gpslogger) until I figure out what's going on. (29 March 18) *** #### A note about ordering TNG pcbs from board manufacturers: 1. Download the folder [TNG_designFiles](https://osf.io/jdrme/files/) from the project's Open Science Framework site 2. Compress the folder (right click and select “compress” on Mac, or right click select “Send to”, then "Compressed (zipped) folder" for Windows) 3. To view the design files, go to a gerber viewer website. [EasyEDA](https://gerber-viewer.easyeda.com/ "EasyEDA GerberViewer") has a good one. 4. If using [EasyEDA](https://easyeda.com/order "PCB Order - EasyEDA") to fabricate boards, click Upload Gerber and select the compressed folder Many other board fabrication houses operate with compressed Gerber files. *** @[youtube](https://youtu.be/LDO5o6MhcLM)