Cemetery sleuths Dale Jarvis and Katie Crane introduce you to the BillionGraves app for your mobile phone.  BillionGraves is the world's largest GPS-linked cemetery data resource. As you take photos with the BillionGraves app, each gravestone is automatically marked with a GPS location. The data is then made readily available at BillionGraves.com for free for millions of families around the globe for generations to come. Dale and Katie talk about the intro workshops they've been running with communities, and give you some tips on how you can get started using your phone to document and map local cemeteries and grave markers.