Copyright © 2013  Grand Rapids Technologies, Inc.                      

Electronic Flight Instrumentation for Experimental Aircraft Since 1991

10/14/2014- Video tutorial/Oshkosh forum presentation, Flying the HXr in IFR by Jerry Morris, is now posted to YouTube.

10/8/2014- New software updates for Horizon HX/HXr and Sport SX add a variety of great new features, including ADS-B TFRs.

9/18/2014- New Nav Database Update

9/11/2014- New Mini software updates available. AHRS 51 reduces sensitivity of pitot/static readout. Display v. 1e adds wind vector to Mini-X and AP with magnetometer.

8/27/2014- Oshkosh Forum video collection is now available (HXr forum is coming soon.)

8/27/2014- Mini-X manual revision A3 now available with information on HITS, Synthetic Approach, and other new features.

8/19/2014- New Mini software updates available including Enroute Highway-In-The-Sky boxes and OAT and Density Altitude display. Also- Air Data Software v. 4

7/23/2014- New Mini-X software update for remote magnetometer calibration

7/9/2014- FDS Pathfinder Remote ADS-B Receiver Supplement published

6/9/2014- OAT Probe Notes published

6/6/14- Mini-X manual released

5/29/2014- New Nav Database Update

5/29/2014- First software updates for Mini are now available (all Mini models)

5/23/2014- Mini-B and Mini-X Now Shipping!

5/23/2014- Mini-B Installation, Setup, & User Manual Released

5/1/2014- HXr Version 2b Released

3/21/2014 - Geo-Referenced Sectionals & IFR Charts Now Available for HX & HXr


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New Tech Support Hours

Monday-Friday, 10 AM-12 PM and 2 PM-4 PM  EST

Phone: (616) 245-7700


Please send all support emails to the above address for the fastest response.  

Technical support for all GRT products is provided at no charge, for all instruments produced over the last 23 years, for original and future owners. While we are happy to assist our customers with questions about our equipment, often the information we provide over the phone is also available in our installation manuals and other resources on our website.

We ask that before you call, please use the materials we provide on the website to make your best reasonable attempt to answer your question. If this proves insufficient, we will do our best to answer your tech calls during support hours. Messages left during support hours will be answered as soon as possible.