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."