Waypoints don't automatically transfer between those models. They are stored in the memory of the unit they are created on and then shared through the network. Shared waypoints will be a different color and can only be deleted on the original unit.
Map cards cannot be shared between those models. Only ONIX and SOLIX models can share mapping.
Look under Network Menu/Network Source Setup menu and select the 999 model for SI. Be sure the 999 has latest software.
Sorry, don't have a response for the Terrova problems as I don't have one. Maybe someone else will be able to assist.