GPSy is a sophisticated Mac GPS communications and GIS mapping program. GPSy connects your Mac to a broad range of Global Positioning System (GPS) navigational units and has advanced mapping, logging, and data transfer features. GPSy has extensive support for USGS DRG topo maps, Internet DGPS-IP servers, GPSyLinks to Internet Map Servers, StreetAtlas 4, and IPC's MapFan II, as well as user-scanned maps, Magellan and Lowrance/Eagle data transfer protocols, Sony IPS protocol, Rockwell Zodiac/Tripmate binary protocol support, Trimble TSIP support and much more.