EFIS Systems

EFIS Systems for Experimental Aircraft

What’s Different About GRT?

Greater Value – Your total system cost could be as much as less than our nearest competitor!

Third‑Party CompatibilityMore choices when it comes to ADS-B,, radios, transponders, GPS and autopilot.

AHRS – The AHRS is the heart of any EFIS system.  We have the only AHRS in the industry that can operate unaided in the event of loss of airspeed, GPS or magnetic heading.

EGT Time History – The EGT graph makes it easy 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.

Outstanding Customer Service – We are only a phone call away.  Our top level technicians and engineering staff are here to keep you flying.




Horizon 10.1 Sport 10.1 Sport EX
Adv. Touch
Sport EX
Sport EX
Sport EX
Mini‑AP Mini‑X
Price $3,995 $2,995 $2,950 $2,400 $2,000 $1,500 $2,100 $1,395
Touch Screen  $250 $250 $275 $275 $275
Dimensions 7 x10.3×3″ 4.8×7.2×2″ 4×4.4×1.9″
AHRS/Air-data Internal (included) Internal (included) Internal (inc.)
Moving Map/
ADS-B Display
$250 $250
Synthetic Vision $400 $400
Vertical Auto-pilot $400 $400 $400 $400
Serial Ports 12 6 6 6 3 3 3 3
Analog Ports 5 2 4 4 $200 $200
Internal GPS 
Remote Avionics Control
Internal IFR Approaches $750

You could save as much as over our competitors systems!

In the comparison below we’ve selected  a few competitor EFIS systems that are the closest match to our systems. Prices and features as of June 6, 2019 and are subject to change without notice. Because every installation is unique, the total system prices for us and our competitors are approximate and do not account for additional hardware, modules or wiring that may be required depending on the aircraft type and interfacing equipment.

Mobile users: be sure to scroll the table up and down, left and right to see all of the data!

7″ VFR 10″ VFR 10″ IFR 10″ IFR Touch 
EFIS¹ $1,500 $1,585 $2,995 $2,585 $3,995 $3,085 $3,995 $4,580
Touch Screen
Optional² No Optional² No Optional² No $250 Included
AHRS/Air data Internal³ $1,200 Internal³ $1,200 Internal³ $1,200 Internal³ $1,200
AHRS wiring harness NA $45 NA $45 NA $45 NA $45
Moving Map $250 $200 Included $200 Included $200 Included Included
Magnetometer⁴ $260 $140 $260 $140 $260 $140 $260 $140
GPS (ADS-B 2020 Compliant)⁵ $495 $590 $495 $590 $495 $590 $495 $590
Mode S Transponder⁶ $1,852 $2,200 $1,852 $2,200 $1,852 $2,200 $1,852 $2,200
Transponder wiring harness Included $55 Included $55 Included $55 Included $55
Transponder antenna $29 $29 $29 $29 $29 $29 $29 $29
Dual-band ADS-B Receiver⁷ $239 $795 $239 $795 $239 $795 $239 $795
ADS-B receiver wiring harness $30 $55 $30 $55 $30 $55 $30 $55
ADS-B receiver antenna Included $29 Included $29 Included $29 Included $29
Engine monitor and probe kit⁸ $1,658 $1,360 $1,658 $1,360 $1,658 $1,360 $1,658 $1,360
Network Hub⁹ NA $50 NA $50 NA $50 NA $50
  1. EFIS Prices include wiring harnesses.
  2. Touch screen option for the Sport EX is $275, Sport 10.1 and Horizon 10.1 is $250.
  3. The AHRS/Air-Data are internal to the GRT EFIS systems included in this comparison. Wiring or mounting of an external AHRS is not necessary!
  4. Magnetometer pricing includes wiring harnesses.
  5. GPS pricing includes wiring harnesses.
  6. Trig TT22.  Wiring harness  included.
  7. Open Flight Solutions FlightBox available at https://www.openflightsolutions.com/flightbox/. Antennas are included but you will need a USB – Serial adapter which is also available via their website.  Our openness to third-party compatibility makes this possible!
  8. Engine monitor pricing is for fuel-injected 4-cylinder Lycoming engines, GRT Remote EIS R66.
  9. A network hub is required for some of our competitor’s systems but is not needed with GRT EFIS systems.  All interfacing equipment connected directly to the EFIS.

Third-party Compatibility

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.  Below is a list of the most popular avionics manufacturers  we interface with.  Other equipment may be supported.  Contact us for more information.

CO Gardian
Flight Data Systems
Free Flight Systems
Insight Avionics
PS Engineering
Trio Auto-pilot
TruTrak Auto-pilot
Val Avionics
Vertical Power

Note: While we attempt to support as many third-party avionics as possible, some equipment from the manufacturers listed above may not be compatible. Please see our Equipment Compatibility List for more details.

Adaptive AHRS / Air Data Computer

With more than 15 years experience producing AHRS, we were anxious to take advantage of the latest in MEMS technologies to update our design. We started with a clean sheet, and built around the solid physics and mathematical algorithms that distinguished our AHRS with its ability to operate unaided. The Adaptive AHRS is the result. It is representative of the constant technological innovation here at GRT Avionics.

Adaptive Attitude Means Redundancy
No longer limited to a single source of yaw reference, the Adaptive AHRS makes use of three sources of yaw stabilization data. Built into every Adaptive AHRS is a miniature magnetometer (for yaw stabilization only), as well as algorithm and software enhancements, giving it the ability to use GPS ground track. In addition, our AHRS has never required air data to function, and that remains true today. What does this mean to you?

  • Attitude data unaffected by the loss of the external magnetometer. The AHRS automatically reverts to gyro-stabilized GPS ground track, or its internal magnetometer.
  • Simplified Installation – One digital magnetometer can be shared with multiple AHRS and the Mini-X/Mini-AP, reducing cost, weight, and complexity.
  • One set of pitot/static connections for a dual AHRS reduces opportunities for pitot/static plumbing leaks, simplifies altimeter calibration and reduces cost.
  • Simple upgrade to a Dual AHRS. The same enclosure houses single or dual AHRS.
  • The internal magnetometer provides yaw stabilization data for a full-accuracy AHRS startup even when an external magnetometer is unavailable.
  • Fast startup. Full accuracy attitude data is typically available 15 seconds after power-up, and there are no limitations on motion during startup.

Ultra-Stable, High Accuracy Air Data Sensors
IFR certifiable altimeter data is complemented with an airspeed sensor so precise that we show airspeed as low as 20 knots. This makes the adaptive AHRS ideal for helicopter and STOL aircraft, and provides confidence in your approach speed with its maximum error of only 0.7 knots at a 70 knot approach speed.

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.