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doghunter- 9-10 collars shouldnt be a problem to add to your units and as others have stated the recent updates have made it to where you can no longer add an ID that has the same LAST number i.e. 4,14,24,34,44. So if you added a collar to your receiver for example and the ID was 1. 11,21,31,41 will no longer be available.

When using multiple receivers the easiest ive found was to add the collars to a single receiver and then add the collar ID's into the remaining receivers using the ID numbers from the first receiver. Removing all the collars off the receiver is key when doing this, double check the doglist as sometimes we stop tracking a collar. This causes it not to show up on the dog screen but it still remains in the system.

20 collars is difficult because you will have some overlap even when using multiple receivers as you are doing. Even if youre only tracking a few dogs per receiver you will still overlap numbers that will cause interference. Its a sad fact when using that many collars together. The best you can do in this situation is continuosly hit the No and Yes prompts when the interference prompts pop up. I understand fully how annoying this can be when following the dogs. Ive tried it all ways I could think of and we still had interference when using that many collars together.

Hope this helps!

OK, so my hunting partner and I are both new to the Garmins. He has a unit and 4 collar and I have a unit and 4 collars. We both want each other's dog's on our units. Can someone tell me step by step the "easiest" way to do this and make it work the first time? What # combos would you try first? Lets say mine and his?
Any help would be greatly appreciated.

As far as I can recall you were never able to add collars with the same last number. That's going back to the 20's even.

Oraca- It is pretty simple. Just add the collars manually and change any that have conflicting numbers. When you add them manually it gives you the option of the ID number to select from. As long as you use a different last digit for each collar you will be fine.

Steve we do it she same way but now sometimes if i clear all the collars and add a collar with id of 2 my buddy clears his and tries to add collar 2 but it is not available. I am not understanding what is going on. if is is unavailable why does mine allow it we always hunt together and all the collars have been on both 220's in the past. after we both clear them it should not matter anyway.

Yes, that is interesting. Since it has been cleared that should not be a problem. Unless a collar was missed. If it continues do a master reset on that unit. Should clear it right up then.