Garmin Astro 320
The Garmin Astro 320 is the current generation of the Garmin Astro Line. This is a significant upgrade from the previous version.Garmin has based this version on the Garmin GPSMap 62 series handheld GPS. The collar unit has been upgraded to the DC-40 with an extended range antenna and some nice integration. The previous version’s collar is compatible with the new unit.
The Garmin Astro 220
The Garmin Astro 220 Dog Tracking System is the original version of the Astro. Released in 2007 this Dog Tracking System is based around the Garmin 60 CSx GPS unit. This standard GPS unit has been enhance to connect to the DC-30 collar and includes additional software to allow for the tracking of the dog. Multiple dogs may be tracked by adding additional collars to the tracking network.