Copyright © 2017  Grand Rapids Technologies, Inc.

Electronic Flight Instrumentation for Experimental Aircraft Since 1991

   Display Unit


Release Date



AHRSUp file

Horizon HXr

Horizon HX

Sport SX

Sport EX

Horizon EX

Includes both:



Adaptive AHRS 64



Adaptive AHRS 6-Jul-2017

Important Altimeter Calibration change for Adaptive AHRS 57 and Mini AHRS 57 - READ ME

Version 64 adds another type of yaw data to improve lateral autopilot performance.  A display software update is required to make use of the data.

Versions 46 and 61 improve attitude accuracy while in turn during turbulence, and due to some cases of vibration (adaptive AHRS only).

Current AHRS Software

AHRS 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 will affect safety of flight.

   Display Unit


Release Date


 Horizon HS

AHRS 46 (0.46)


Version 46 improves attitude accuracy while in turn during turbulence.

 Horizon WS

 Sport HS

 Sport WS

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.

*Important:  Before updating software, please read the AHRS Software Update Instructions & Revision History.*

New! - AHRSUp files can be loaded directly by using SET MENU, AHRS Maintenance, Load AHRS Software, pushing USB when prompted, and selecting the file from the list.  (Requires latest HX/HXr/SX display software.)

Download Download Download Download

AHRS Software files for older displays

AHRS and Adaptive AHRS Software for HX/HXr/SX

View Adaptive AHRS software change history.

   Display Unit


Release Date


No beta software available at this time