The GTX 328 Mode S transponder is designed to satisfy the new European regulation for Mode S implementation for VFR (visual flight rules).

By optimising the best selling features and industry-leading technology of the GTX 330 Mode S Transponder, Garmin is able to offer customers the GTX 328, a lower cost Mode S solution that meets the European regulations.

The GTX 328 is intended to serve VFR/Class 2 aircraft where there is adequate size and power consumption support for a GTX 328 unit. The GTX 328 is designed to be a straightforward retrofit.

Features such as displaying outside air temperature, altitude monitoring, count up and count down timers (using a built-in digitized voice annunciator to alert the pilot when preset altitude limits have been exceeded or timer expiration), density altitude functions, and front-panel input for flight ID.

The GTX 328 has a solid-state design that uses less power, reduces heat emissions and eliminates warm-up time.