996P2/325P2 Search and Store
It may not be as feature rich as the Discovery mode, I've been using the Search and Store and it works very well in finding new channels or ID's . You can Search and Store - Service Search ( Air ,Railroads,Public Safety and more). Search and Store your P25 Systems to discover new ID's. When a new channel or ID is found its automatically stored .
From Mark's Easier to Read 325/996p2 manual
Search and Store
"Lets you search and store frequencies from enabled custom search ranges or a service search range into a conventional system, or new talk group IDs into a trunked system."