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I have a garmin astro 320 with dc 40 collars, got a dc 50 collar and it will not "add" to my GPS why? I have try ed several times, abs had a friend or two try. Why can't I add a 50 collar? My friend added it on his GPS looks just the same as mine he has dc 40 and 50 collars added to his and I tried to add one of his 50 collars and could not? I'm done trying to figure out this thing.

Have you tried doing an update on your GPS? Might just need an update to allow you to add it. Could be wrong but worth a try

how do I go about doing an update?

If you google how to update a Astro 320 it will give you all the steps you need. You can update all your collars too. I have updated mine a few times and still have to google it every time lol

call garmin have your computer and gps ready they will walk you through it.

Thanks for help guys, it took me 20 years to figure out dam telemetry collars abs with GPS I'm starting all over again learning. I'll be having some more questions in sure. Thanks again