Garmin just released a new software update for the Garmin DriveTrack 70 LMT. This update was to address some pairing issues that the DriveTrack 70 was having pairing with the Astro 320, Astro 430, and the Alpha 100 heldhelds.
Software Version 5.50
Live as of October 23, 2017
Version 5.40 to 5.50
– Fixed an issue where the Garmin DriveTrack 70 would not connect to broadcasting dog tracking devices.