Waypoints, Routes, and Tracks are GPS data, not map data. You don't need any background mapping to use the GPS functions.
GPS is not mapping and mapping is not GPS.
Mapping is just a background on the Chart Plotter view.
Do both units have current software?
Does the iPilot Link have current software?
Does the remote have current software?
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1