Originally Posted by Mil T
I'm really frustrated in thinking I have to spend another $ 200 for mapping software to use these GPS's I have.
Yeah, sounds about right.
If you have locked software that is tied to a unit, it is just that - tied to that unit. Once you do own a locked set, you can use it on that unit for as long as you want.
If you have unlocked software, like Roads & Rec, or Topo, you can use it on any of them.
Sounds like you need to get the other inmate to transfer ownership of the new GPS to you, or give you the unlock codes. Those and the discs are really all you need to get local maps on the unit.