Copyright © 2016  Grand Rapids Technologies, Inc.

Electronic Flight Instrumentation for Experimental Aircraft Since 1991

Click here to see Mini-GA Screenshots

Mini-GA Connector Wiring

Mini-GA 4.3” Portable EFIS

An Update For Any Panel

The Mini-GA is a portable electronic device especially designed for the certified aircraft.  It is a complete EFIS, incorporating the same technology that made GRT Avionics famous for its high-integrity attitude sensing (AHRS) in the experimental airplane market.  It can be installed in minutes to update a traditional panel, or provides a valuable addition to any panel, at an unbeatable price.

As A Primary Flight Display

The Mini-GA primary flight display brings terrain and obstacles to your panel.   It is a reassuring reference when flying in instrument conditions, and greatly improves situational awareness, VFR or IFR.  Rotating drums and tapes are driven by GPS data, making GPS derived altitude and speed data, as well as their rate-of-change easily observable. Internal or external GPS navigation and steering data is provided on the PFD.  Highway-in-the sky guidance is provided to any runway in the database. The addition of the external magnetometer adds heading and winds for further situational awareness.

Mini features:

A Full-Featured Moving Map

The moving map has the features you would only expect to find in a full EFIS.  It includes such features as terrain relief, relative terrain height color coding, nearest functions, airport details including frequencies and runways, and much more. When connected to an external GPS, its flight plan and steering information can be displayed on and drive the map.

Smooth Rotation

Hand-held or panel mount GPS navigators update their display once per second.  Some EFIS based moving maps do same. The result is a jerky and delayed map.  The Mini combines AHRS and GPS data to update its map at up to 15 times per second, resulting in a smoothly rotating map.  Rolling out of a turn precisely on track becomes easy and the extended runway centerlines eliminate the guess work, making navigation easier and more precise.

Navigation Head with HSI

The Mini-GA extends its role by coupling to other navigation sources, such as navigation radios. The Mini includes and OBS (radial) selector for VOR or LOC/ILS navigation. Lateral and vertical deviations are also displayed on the primary flight display.

Quality Throughout

We don’t compromise on quality and it is evident before even turning the Mini on. The faceplate and case are milled from aluminum billet, protecting the instrument from physical damage, and providing structural integrity to your panel. Robust ports for the pitot/static connections mean you won’t be chasing pitot/static leaks here.  The buttons and knobs, the parts that get the most physical use, are also examples that quality was and always will be the first priority. We have used a genuine Grayhill rotary encoder for the knob input. While they are more expensive, they have performed flawlessly since we began using them and provide the tactile feel necessary for an aviation application.

Mounts in minutes

Install the mounting plate into any 3 1/8” instrument hole, or use the flush mount (not shown) to mount the Mini-GA to any flat surface.

The Mini-GA snaps into the mounting plate. Push-button latches (top and bottom of instrument) allow it to be removed as desired.

The mounting plate provides spacing so that the Mini-GA can overlap nearby instrument without obscuring them to allow mounting the tight panels while still accommodating the highly-readable 4.3” screen.

The features continue…

Features include:

Read more about it by downloading the Mini-GA User, Settings and Installation Manual.

The moving map in arc-view mode. Notice the color-coded terrain.

Clicking the right knob brings up a short-cut menu that

provides commonly used functions on the soft-keys, as shown.

The primary flight display screen terrain showing relative height. In the upper left the autopilot/flight director mode is shown as synthetic approach to runway 35. The flight director is commanding a slight pitch down in the center of the screen. The airspeed and altimeter drums move smoothly and the high-contrast digits make them highly readable. Extending up from the runway is the way-point balloon.



GPS Groundspeed

GPS Altimeter

Attitude Indicator

Magnetic Heading With Remote Magnetometer


Turn Coordinator



Sunlight Readable LED Display

Wide Viewing Angle

480 x 272 Hi-Res Screen

Data Logging

Flight Director

Heading Bug

Altitude Bug

ARINC 429 Interface


GPS CDI  Needle

Highway In The Sky

Synthetic Vision

Stand-Alone GPS Navigator

Moving Map

Internal 5-Hz VFR WAAS GPS

Glareshield GPS Antenna

GPS Serial OUT

Input for External GPS





**Optional Remote Magnetometer


***Optional ARINC 429