Newbie call sign question

[WRVZ808]

Newly licensed. Still learning. Still green.

I’m in East Tennessee, listening to what I believe is the North Georgia net? (Forgive me if my terms are off) 
 

My question is…when I hear folks giving their call sign, some follow it with another call sign of some sorts with a state or city, followed by a number. Or they use that last part to identify only. 

What are those for?

Example: “This is WRQN123-Alabama129” or just “Chattanooga133 clear and monitoring” 

[SteveShannon]

14 minutes ago, WRVZ808 said:

Newly licensed. Still learning. Still green.

I’m in East Tennessee, listening to what I believe is the North Georgia net? (Forgive me if my terms are off) 
 

My question is…when I hear folks giving their call sign, some follow it with another call sign of some sorts with a state or city, followed by a number. Or they use that last part to identify only. 

What are those for?

Example: “This is WRQN123-Alabama129” or just “Chattanooga133 clear and monitoring” 

My guess is that the part after the dash is the network node they’re connected to. 

[wayoverthere]

It may be that the network operators have assigned them a user id of sorts on the network, based, as @Sshannonmentions, on which node on the network they connect through

[kerstuff]

North Georgia GMRS use Tac numbers after their call signs. That's the way they "prove" they are paid members. 

[kerstuff]

https://nggmrs.org/

[kerstuff]

This is their site. I live in Monroe County (Coker Creek) TN & listen to them daily.

[WRVZ808]

Thanks for the responses! I assumed that was the case, but I couldn't know for sure. Not knowing of anyone in my area that uses GMRS to ask. I'm sure I will meet folks in my general area to learn from as time passes, but this forum will be my source of info to learn in the meantime. 

Thanks again!