Copyright © 2017  Grand Rapids Technologies, Inc.

Electronic Flight Instrumentation for Experimental Aircraft Since 1991

  Navigation Database

Valid Date

Posted Date

Free U.S. Navigation Database (all systems)



   Note: The Nav database is on a 28-day cycle.  New updates are posted when we receive them.

   Software Update Instructions (all systems)



Additional Map Databases

This is a one-time update for older Horizon and Sport units.  Most systems already have been updated for these databases, which were released in 2009.  

To Update Display Unit: Download each file to the root directory of the USB thumb drive.  Install the thumb drive to the display unit and choose each database file’s “LOAD” function on the SET MENU> Display Unit Maintenance> Database Maintenance page.  The default setting is to display them on North UP pages only.  After the display is finished loading the files, you may go to SET MENU and choose MOVING MAP.  Locate the new databases on the list.  Here you may choose to display them on ALL MAP PAGES, which will display them in Track UP.

Note: WS and HS models may need extra storage to use all of these databases.  The easiest way to add extra memory is to leave the USB memory stick attached to the EFIS.  

GRT US State Boundaries

GRT US Lakes and Streams

GRT US Major Roads

GRT US Railroads

GRT US Populated Places

Download Download Download Download Download

   Optional or Non-U.S. Navigation Database (All Systems)

Jeppesen Avionics Database Subscription

Note: One Jeppesen data subscription can be shared among all GRT EFIS screens in the airplane.  Database sharing is supported by EFIS software versions 2a (HXr), 6a (HX), 10 (SX), all Mini, and newer versions.  

TAWS Terrain software  for HS & WS

NOTE: This software is for terrain warning only. It does not support synthetic vision.  

Terrain - 48 States - USA

Terrain NW - World - Northwest (Canada, US, Mexico, …)

Terrain NE - World - North Eastern (0°-90°N, 0°-180°E)

Terrain SW- World - South West (90°S-0°, 180°W-0°)

Terrain SE - World - South East (90°S-0°, 0°-180°E)

Terrain EU - Europe (30°N-70°N, 20°W-60°E)

Terrain PM - Europe, Western Asia, Middle East

Terrain CSA - Central and South America (60°S-20°N, 93°W-30°W)

Download Download Download Download Download Download Download Download

Note: Change terrain file name to terrain.dat before installing into EFIS unit.

Navigation Database Updates

   Approach Plates & Charts (Horizon HX & HXr)

Seattle Avionics Geo-Referenced IFR & VFR Chart Subscription Information

Free FAA PDF Approach Plates (non-Geo-Referenced-  Courtesy of Mike Stewart)