The S-Tec System 55X (STec 55X) autopilot from Pacific Coast Avionics utilizes GPS Roll Steering and tracking with glide slope capture and track, VOR/localizer/back course intercept and tracking, and vertical speed commands. The S-Tec 55X Computer / Programmer has an LCD digital display for easy pilot operation. The S-Tec System 55X autopilot display is designed for mounting in the standard avionics stack. Options of the S-Tec 55X include altitude pre-select, remote annunciator, flight director, heading pre-select, and auto-trim. Panel unit: 6.25"W x 1.5"H x 8.5"D.