HamLog Field Day Server (FDS) is an application to synchronize Field Day Logs between iOS devices running the HamLog Field Day Tool as well as the stand-alone HamLog Field Day app for Mac. This app can also log locally. For Field Day sites out there running this suite of apps, you would only need one copy of the server running on a Mac. All other Mac computers could be running HamLog FD (not FDS) and connect to this application.