Copyright © 2016  Grand Rapids Technologies, Inc.                      

Electronic Flight Instrumentation for Experimental Aircraft Since 1991

Compatible Equipment

Compatible Equipment Documentation


& Manuals

Software Updates

Software Updates

We are experimental aircraft builders and enthusiasts just like you and we are here to help your project become a success!  You are welcome to browse & join our online GRT Forum to add to our information pool and access the knowledge of other GRT users.  If you can’t find what you’re looking for on these pages, please give us a call and we’ll be happy to help.

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.  When calling, please have the  serial number and software version of your unit handy.  We often ask for this during troubleshooting, so it might save you a trip to the airport.  

We’re here to help you throughout your decision-making, installation and flight testing process.


Service Bulletins

Online Forum

Service Request Form

Video Tutorials

Tech Support Phone 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.  

EIS Troubleshooting

EIS Troubleshooting Guide