Garmin GHA 15 height advisor approved for certified aircraft
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OLATHE, Kan./Feb. 4, 2026 – Garmin (NYSE: GRMN) today announced the availability of the GHA 15 height advisor. Previously approved only for experimental aircraft, the GHA 15 is a small and lightweight height advisor that uses radar technology to provide height above ground level (AGL) information. The GHA 15 for certified aircraft can display height AGL on compatible GI 275 electronic flight instruments1. The Federal Aviation Administration (FAA) has granted Supplemental Type Certificate (STC) approval for the installation of GHA 15 in more than 500 certified class I & II aircraft.
The GHA 15 calculates height AGL by sending radio waves to the ground and determining the time it takes to receive the signals back. It processes hundreds of measurements per second and applies advanced digital filters to maintain continuous readings – even over water or in challenging terrain environments. AGL readouts are shown on the GI 275 electronic flight instrument1 at altitudes as high as 500 feet AGL.
Using the readings provided by the GHA 15, the GI 275 can also provide AGL audio callouts2 to help keep the pilot’s eyes looking outside the cockpit. Beginning at 300 feet, the pilot will hear audible AGL altitude callouts at select intervals down to 1 foot AGL. The pilot can configure the callouts to start and stop at specified altitudes. Knowing precise height AGL can be helpful to pilots during landings and flying in areas where limited barometric altimeter setting information is available – such as backcountry flying.3
The single module integrates all electronics into one compact unit that attaches to the bottom of the aircraft. Slightly larger than a deck of cards and weighing less than one pound, the height advisor requires minimal space and modification for installation on the aircraft.
The GHA 15 is available now for certified aircraft at a suggested retail price of $2,695. For additional information, visit Garmin.com/GHA15.
Garmin products and services have revolutionized flight and become essential to the lives of pilots and aircraft owners and operators around the world. A leading provider of solutions to general aviation, business aviation, rotorcraft, advanced air mobility, government and defense, and commercial air carrier customers, Garmin believes every day is an opportunity to innovate. Recipient of the prestigious Robert J. Collier Trophy for Garmin Autoland, Garmin developed the world’s first certified autonomous system that activates during an emergency to control and land an aircraft without human intervention. Visit the Garmin Newsroom, email our media team, connect with @garminaviation on social, or follow our blog.
Garmin GHA 15 Height Advisor Now Certified for Aircraft
Garmin announced the GHA 15 height advisor is now approved for certified aircraft. This compact, lightweight device, previously for experimental aircraft, uses radar to provide height above ground level (AGL) information. The unit mounts to the aircraft’s exterior and displays AGL readings on compatible GI 275 electronic flight instruments, reaching up to 500 feet AGL. It offers audio callouts to assist pilots in maintaining situational awareness during landing and in areas with limited barometric data. The GHA 15, priced at $2,695, is a single module integrating all electronics, requiring minimal space and modification for installation.
