With Narco's NAV-121, you can add an entire VOR/LOC system in one box. It uses just one instrument hole, but it does the job of two normal units.
The Narco NAV-121 contains:
- 200 channel VOR/LOC NAV Receiver
- VOR/LOC Indicator
The NAV-121 also provides automatic DME channeling, and is TSO'd.