Horizon 10.1 EFIS

The Horizon 10.1 is a no compromise, full-featured EFIS designed for high performance and easy installation.

  • Internal AHRS and Air-Data simplifies installation and is included in the price!
  • Auto-pilot ready, ADS-B and remote avionic control capable. 10.1″, High resolution (1280×800) IPS display.
  • Our Safe-fly ADS-B 2020 compliant GPS/uAvionix echoUAT may be mounted directly to the back of the Horizon 10.1, making installation even simpler.

Includes AHRS/Air-Data
and wiring harness.


Primary Flight Display

On the PFD you’ll find pilot-selectable insets and split-screen views providing maps, traffic, engine monitoring, weather, traffic alerts, custom checklists, and even geo-referenced sectionals or en-route charts, keeping the PFD view unchanged so that your instrument scan remains unchanged.

Multiple Views for Single Display Systems

Both the full- screen PFD and Map views can display inset windows in the lower corners of the screen.

Insets are also complimented by a split-screen view. This a popular feature with single screen installations, providing generous size primary flight data, moving map and engine data, intelligently combined on one screen, practically eliminating the need to change your screen selection.

Click one of the thumbnails below to explore the details of the various insets.


Dedicated Remote Avionics Controls

The Horizon 10.1 expands your options by letting you remotely control as much or as little of your radio rack as you desire. The dedicated controls and simple operation makes this immensely practical, leaving your valuable panel space available for other uses. Remote up to 2 Com radios, 2 Nav radios, transponder, intercom, and audio panel. Panel mount radios can also be conveniently tuned. The Horizon 10.1 works with a variety of leading avionics manufacturers, so you will never be locked into one brand for your interfacing remote avionics. Remotes, such as the Trig TT22 transponder, can offer a cost savings by negating the need for a dedicated control head.

As with the HXr, the Horizon 10.1 allows you to use your Android device for extensive touch-screen menu tuning choices for you or your co-pilot.

Sectionals, Airport Diagrams, En-route Charts, Approach Plates, and more…

Sectionals, airport diagrams, en-route charts and approach plates can be displayed, with the airplane position geo-referenced on them. Sectionals and en-route charts are displayed with Horizon 10.1 generated airspace, obstacles, flight plans and traffic overlaid, so that alerting is not lost. Data for these functions is provided by Seattle Avionics.  The Horizon 10.1 also includes a PDF viewer which allows you to display free approach plates, airport diagrams and other data provided by the FAA. (Geo-referencing is not provided).

Engine Performance Monitoring

Having produced the EIS engine monitor for over 20 years, we’ve accumulated a great deal of personal and customer engine monitoring experience. From this came such exclusive features as the exhaust gas temperature (EGT) time history. With a simple graph of the last two minutes of all EGTs, our engine monitoring system makes it effortless to distinguish between engine problems affecting one cylinder, or the entire engine. This distinction could be essential when making decisions in response to engine problems, especially at critical times such as initial climb out. We find it so useful that we never takeoff without it displayed, and we recommend you don’t either.
As a practical matter, the EGT Time history is our favorite way to get reassurance of normal engine operation. Now whenever you fly over water, or at night, you will have the confidence that only comes from seeing a history of steady EGTs. It reduces anxiety and adds confidence to any flight.

CHT time history proves useful by making the trend obvious. This is especially useful in high-performance airplanes, such as RV’s, Lancairs and all pushers, where engine cooling can require some pilot technique to manage. It leaves no doubt which way temperatures are headed.

When it comes to flying economically, the specific fuel consumption (SFC) display is just the ticket. Its measure of engine efficiency confirms when you have leaned properly and tells you when you need to lean again. Without SFC, it is nearly impossible to know if re-leaning is required due to changing conditions. Next to the EGT time history, this is one of our favorite engine monitoring features. It literally pays for itself. Miles per gallon through the air makes it easy to detect changes in efficiency of your airplane due modifications for drag reduction or if you just forgot to fully retract your flaps. Miles per gallon over the ground lets you optimize your economy while accounting for the wind.

Engine Data with a Bonus

Engine data is provided to the Horizon 10.1 via the Engine Information System (EIS). The EIS is a complete instrument with a display and user-interface. Models are available for practically every engine, from 2-strokes, 4-strokes, turboprops and turbines-we have instrumented it. The EIS may be remotely mounted, just like any data collection device, but it can also be mounted in the instrument panel as a primary or backup display of engine data. In tandem seating airplanes it can be used as an instrument for the rear seat. Engine limits can be set in the EIS and can be used to drive its own warning light, even when remotely mounted.

Simple Operation

Simplified screen layouts and more buttons also allow for simplified operation. Menus are practically identical for the PFD and map screens. New to the EFIS and not sure what a softkey does? Go ahead-press it! Every softkey is labeled and the Horizon 10.1 shows you the options available before it does anything. Pressing the same softkey again exits without action. Always find your way back to the main screen view with the blue “HOME” softkey. Color coding and “hold for shortcut” features further streamline operation. Simple, effective and efficient.

Turbulence Optimized

When on the ground or in calm air, practically any pilot interface will work. Introduce turbulence and the story changes. To operate an EFIS in such conditions, the pilot must be able to position his fingers on the control (knob or button) without activating it. Activation of the control can then take place with assurance the intended operation will be performed. This is why the Horizon 10.1 does not have a joystick type control. It has high-tactile force knobs and buttons and a ledge above the buttons to steady your hand. It’s proven, and it works.

GRT Safe-Touch – Your PFD is now an Autopilot Mode Control Panel!

GRT Safe-touch option provides touch screen interaction without the risk of inadvertent activation. We use the simplicity of the touch screen for making selections, such as choosing the leg of the flight plan to be modified, with the positive action of a softkey press before activating the selection. Simple and secure, even in turbulence, nothing happens until you confirm or cancel and touch screen edits with a softkey press.

Touch screen functions will be added over time, but the first release will include at least the following:

Shortcut to setting of autopilot airspeed/vertical speed/altitude targets. Just touch the airspeed/altimeter, or vertical speed display and select the target with the knob. Your PFD becomes an autopilot mode control panel.

  • Flight plan editing, including moving, deleting, and inserting waypoints.
  • Flight plan “rubber-banding”
  • Direct-to waypoint selection
  • Airport/navaid details selection
  • Map Slewing

Real Redundancy

Redundancy will not be compromised in panel designed around the Horizon 10.1. The extensive interfacing and processing power of the Horizon 10.1 allows dual inputs for attitude/air data, while still accommodating dual GPS and nav/com into every Horizon 10.1 display unit. Automatic cross-checking is provided, and rarely must data sources be divided among display units. Each device is wired directly to each display unit, creating a simple, robust connection for ultimate redundancy. Data buses are not used for communication between various devices, as these introduce the opportunity for a single point failure. Even dual data buses are subject to possible data overloading or other common mode faults that can simultaneously fail both buses (as has been experienced by one of our competitors).

Autopilot Ready

The Horizon 10.1 includes full autopilot functionality. Just add GRT servos and you are on your way to a fully automated cockpit. Like all GRT EFIS systems, it can also control an external stand-alone autopilot. Even without servos, all autopilot functions are available to drive the flight director, giving you a single cue to follow to control attitude and navigation, greatly improving accuracy while reducing workload.

Already own an autopilot? Just wire it to the Horizon 10.1 and it will couple it to all your navigation sources.

Heads-Up Display Capable

A heads up display can now be part your your GRT Avionics equipped airplane for as little as $300. Our pursuit of heads up display technology has led to support for the Hudly automotive after-market heads up display. Graphics optimizations in the GRT remote app, combined with the impressive readability and value of the Hudly have resulted in the first practical heads up display for experimental and general aviation (certified) airplanes.

  • Aircraft mounted heads-up display
  • Sunlight Readable Color Symbology
  • Primary Flight Data
  • Flight Director and HSI Guidance
  • Lateral/Vertical Deviation for Approach
  • Stall warning and all other features of GRT Remote app

PFD Video with Overlay

The Horizon 10.1 supports forward looking low-light or infrared cameras. Controls are provided to scale and align the video with the EFIS orientation. This allows the EFIS to draw outlines around runways and way-points, and also show the flight path marker correctly against the image from the camera. Video can also be displayed without an overlay, as might be desired for other camera views.

Audio Alerts

Voice alerts are provided for critical engine and flight conditions, as well as altitude call outs. System changes, such as autopilot disconnect and way-point passage are also annunciated. Angle-of-attack audio utilizes an attention-getting beeping tone that increases in urgency as your approach stall. You can even use your own audio recordings for your alerts.

Angle of Attack Sensing / Stall Warning

The GRT Avionics AOA function drives on-screen AOA symbology that shows too fast/too slow/optimal approach speeds, as well as stall warning. In addition, an audio output is providing an approaching stall warning annunciation (a pulsating tone that varies with proximity to the stall warning angle) and a solid tone indicating stall is imminent.

Sensing is via a two-port 45 degree pitot tube, such as those commonly available from a variety of manufacturers, or using a probe fashioned by the builder. This method has no moving parts, and allows the use of heated pitot tubes that preserve the stall warning function even in the presence of icing.

Control Radios and Flight Plans with Your Android Phone or Tablet

Install an optional Bluetooth dongle and connect with your Android phone or tablet using our GRT REMOTE App for Android. Fully control your connected radios, create & edit active flight plans and view the flight instruments all on your Android tablet or phone–perfect for the backseat co-pilot! The radio tuning portion of the app offers so much information, you may not want to tune them without it!

The Source of the Attitude

The integrity of an EFIS is dependent on the integrity of the attitude data that drives it. GRT Avionics has always lead the way with the only AHRS in the industry that can operate without airspeed or GPS aiding it.

Free Database and Software Updates

Navigation database updates are provided free for all US territories. Software updates are also free. All GRT equipment includes bootloaders, allowing them to be updated via USB without removing them from the airplane.

Generous Connectivity Options

The Horizon 10.1 includes 12 serial ports, in and out, and dual USB ports. Multiple display units are coupled via Ethernet. Analog interfaces include 6 analog inputs and 6 discrete outputs. We have the interfaces you need now and in the future.


Manuals Revision Release Date
Sport/Horizon 10.1 User Manual Preliminary 10/30/2019
Sport/Horizon 10.1 Install Manual Preliminary 9/20/2019
IFR Approach Users Manual (Horizon 10.1 with IFR approach option only) Initial 7/20/2018
Optional Wiring    
Trim/Flap Sensor Installation A5 6/20/2014
OAT Probe Installation Notes (All Systems) A1 8/28/2014
Drawings Revision Release Date
Sport/Horizon 10.1 Dimensional Drawing A 6/2019
Sport/Horizon 10.1 Mounting Template A 4/29/2020


*** Important Service Bulletin for Early Production 10.1 Series EFIS Displays ***

Software Version Release Date
Display Unit Software

Release Notes and History

Audio Alerts (optional)

Audio Alert Instructions
2.01 10/26/2022
Beta Software

This section contains software in the development or testing stage for customers interested in testing new features before a final release. The software below may be incomplete or have unexpected behavior. Never use in instrument conditions or other situations where EFIS failure or unexpected behavior will affect safety of flight.

  Version Release Date
Display Unit Software (beta) 2.02-beta5 3/25/2024
Version 2.02-beta5 adds support for the PMA450EX audio panel, adds support for the FLIR Boson USB camera, fixes issues switching between some split PFD, chart, and flight plan pages, adds support for the newer serial interface of newer Garmin radios (GTR200/GTR225/GNC255) and sending GPS data to them (GTR225/GNC255), adds G3X Text serial output, and adds initial support for landing gear indicators.
Miscellaneous software
Software Description
AHRS Software The most current release of the AHRS software is included in the Display Unit update files. Most GRT EFIS users will never need to use this page. However, there are times when customers request AHRS-only updates or would like to try beta testing new AHRS software.
Checklist (Example) All versions of the GRT EFIS with a MAP page (except Mini) contain a checklist function (with recent software). The checklists must be created on a computer in plain text format and loaded into the EFIS as CHECKLIST.TXT. A text editor such as Notepad will work.
Demo File Decoding and Analysis

SavvyAnalysis.com analyzes engine data as a service.

Emarit Ranu’s Excel-based Flight Data Analysis Tool can open demo files in Excel to make graphs, compute statistics, and show flight paths on Google Earth.

Carl Morgan’s Demo File Decoder can load flight data into a spreadsheet & plot GPS data on Google Earth.

Demo Flight HXr

Demo Flight HX

Demo Flight SX
Copy the files inside these ZIP files to your USB memory stick to play back some recorded approaches and weather on your EFIS.  *Note that any demo file can be played on any GRT EFIS, regardless of which model it was recorded on.
EIS Log Allows EIS recorded data to be decoded in spreadsheet form. Record on your EFIS memory stick or to a laptop and decode the file with this software.
Version 11 3/09/2015
GRT Remote App The GRT Remote App offers many tools to ease pilot workload for flight planning, radio tuning and offers support for the Hudly Heads-Up-Display. It is also a unique and simple solution for back-seat flight instruments and controls for radios and flight planning.
Version 2.3.0 Updated 1/05/2017
Install issue: The latest Android 14 refuses to install this old version. We are working on an update.
Stratux serial patch Serial output patch files for use with official Stratux software releases. See our Stratux Supplement in Miscellaneous Documentation for instructions.
Trig TT22 Adapter Software Version 5 adds support for more types of compliant GPS data and supports sending air data for ADS-B air-ground switching by setting Squat Switch to AHRS and GPS data (requires display software update).
Version 5 released 7/6/2017


Navigation Database

Navigation Database Valid Date Posted Date

Free U.S. Navigation and Procedures Database for Horizon 10.1 and HXr with internal procedures option
For Horizon 10.1 and HXr screens with the internal IFR approach procedures option, this database includes the regular navigation data and procedures in one file. This file is also compatible with other 10.1/HXr/HX/SX/EX/Mini models, they will ignore the data they can’t use.

7/11/2024 7/9/2024

Free U.S. Navigation Database for all other systems

7/11/2024 7/9/2024
Note: The Nav database is on a 28-day cycle. New updates are posted when we receive them.
Optional or Non-U.S. Navigation Database (All Systems)
Jeppesen Avionics Database Subscription
Note: One Jeppesen data subscription can be shared among all GRT EFIS screens in the airplane.
Approach Plates and Charts (Horizon 10.1, HXr and HX only)
Seattle Avionics Georeferenced IFR & VFR Chart Subscription
Free Non-Georeferenced FAA Approach Plates


Compatible Equipment

GRT Systems are Specifically Designed to Play Nice with Other Manufacturers’ Equipment

Every builder has his or her own taste when it comes to devices such as weather & traffic information, radios, transponders, and GPS units. We strive to give builders a choice when it comes to third-party equipment. This page is an overview of popular choices of our customers, with equipment supplements for some to help you install and use your product to its full potential with a GRT EFIS system. Check this page often for updates, as we are always adding to our equipment supplement library and third-party vendor list.

General list of Compatible Equipment

ADS-B In (traffic and weather)

  • GRT Discovery ADS-B Receiver
  • Dual Electronics XGPS170D
  • Dual Electronics XGPS190
  • Flight Data Systems Pathfinder
  • Free Flight Systems XPLORER
  • iLevil Technologies iLevil AW
  • iLevil Technologies iLevil SW
  • Open Flight Solutions Flight Box
  • Radenna SkyRadar-DX
  • Radenna SkyRadar-D2-v2
  • Stratux

ADS-B Out Only

  • Garmin GTX-330-ES
  • Trig TT21
  • Trig TT22
  • Trig TT31
  • uAvionix tailBeacon-X

ADS-B UAT (In and Out)

  • Free Flight Systems RANGR-FDL-978-XVR
  • uAvionix echoUAT

Audio Panel/Intercom

(Horizon 10.1 only)

  • PS Engineering PAC15EX
  • PS Engineering PDA360XR
  • PS Engineering PRI30EX


  • GRT Auto-pilot Servos
  • Trio Auto-pilot (requires control head)
  • TruTrak Auto-pilot (requires control head)

Carbon Monoxide

  • CO Guardian

Comm/Nav Radios

Note: All GRT Avionics EFIS systems can push frequencies to com and nav radios, but only the Horizon 10.1 and HXr EFIS offer full remote control of com, nav radios and intercoms.

  • Any radio with RS-232 SL30 format
  • Garmin GTR225
  • Garmin SL30
  • Garmin SL40
  • Microair M760REM
  • Trig TY91
  • Val Avionics

GPS Receivers

  • GRT Avionics Safe-Fly 2020
  • All types with serial output

IFR Navigators

  • Avidyne IFD 440/540/550 Series
  • Garmin GNS430/530 Series
  • Garmin GPS175
  • Garmin GTN650/750 Series

Power Management

  • Vertical Power (All Models)

TIS Traffic

  • Garmin GTX330
  • Trig TT21
  • Trig TT22


  • Garmin GTX-330-ES
  • Sandia STX165R
  • Trig TT21
  • Trig TT22
  • Trig TT31
  • uAvionix TailBeaconX

Weather (non ADS-B)

  • L3 Stormscope WX-500
  • XM Weather

Equipment Supplements

These “mini-manuals” explain how to install and set up popular devices and avionics that work with GRT EFIS systems. You can pick the ones you need, print them out, write notes all over them and store them with your aircraft’s electrical system diagrams. Check back often for new releases or email us for special requests. We often create new supplements based on customer requests and then post them here for everyone’s benefit.

Note: Only Horizon 10.1 and HXr EFIS systems are capable of full remote control of com radios, nav radios, and intercoms.

Equipment Supplement Revison Release Date
ADS-B Receiver Supplement (universal) A 3/17/2016
Avidyne IFD440/540 Series (Garmin GNS430 supplement, pin compatible) A3 7/09/2014
Flight Data Systems Pathfinder ADS-B Receiver A1 11/10/2014
Garmin GNS430/530 Series A2 6/10/2014
Garmin GTN650/750 Series A1 6/10/2014
Garmin GTX327 Transponder A 12/15/2014
Garmin GTX330 Transponder A1 10/23/2013
GRT External GPS Modules A 5/31/2013
Microair M760REM User Manual 1 3/10/2011
PS-Engineering PAC15EX Remote Audio Panel/Intercom for HXr A1 4/29/2014
PS Engineering PDA360XR Remote Audio Panel/Intercom  Manual   10/2016
PS Eng PRI30EX Remote Intercom Manual   6/2013
PS Eng PRI30EX Remote Intercom Supplement A 3/2016
Radenna SkyRadar D2 and DX ADS-B Receiver A2 7/09/2014
Stratux (Raspberry Pi – Based) ADS-B Receiver A1 3/16/2016
Trig TT21/TT22 Transponder A2 5/28/2014
Trig TY91 Remote Com Radio (for adapters purchased after 2020) D 11/23/2021
Trig TY91 Remote Com Radio (for adapters purchased prior to 2020) A 12/13/2013

Horizon 10.1 Options


Add-ons total: