As a Horizon WS Replacement...Thousands of our original Horizon WS display units are still performing flawlessly in airplanes around the world, and are still fully supported by GRT Avionics with software, database updates, and hardware repairs using our extensive inventory of spare parts. This illustrates the long-term support that you can expect from GRT Avionics...a support life you may not get from large avionics manufacturers. So while there is no pressing need to replace your Horizon WS, technology has progressed, allowing us to provide the Horizon EX display unit as an easy upgrade option for our Horizon WS users, and bringing a wealth of new features to your panel.A drop in replacement, the EX fits in the same mounting hole, and typically requires no wiring changes*. User settings can be copied from your existing WS into the Horizon EX with the “Setting Backup” feature. No avionics experience is required. Anyone can upgrade their panel in minutes.Operation of the Horizon EX is practically identical to the WS. Upgrading is a matter of becoming accustomed to a beautiful screen, and enjoying the situational awareness so naturally conveyed by the synthetic vision.As a Display Unit with any GRT EFIS…The Horizon EX Display Unit brings a high-resolution 7” screen, synthetic vision, and full functionality to your panel at a remarkable price, with a touch screen interface option. The compact size fits nicely into any panel. Attitude/Air data can be provided to it from our original AHRS, our (current) Adaptive AHRS, or any Sport display unit equipped with an AHRS.