Abstract: There is disclosed an annunciator for verbalizing altitude-related messages during the descent of an aircraft. Announcements such as "nine hundred," "eight hundred," etc. are made as the aircraft descends through respective "hundreds" levels; such announcements are not made during an ascent. In addition, the word "terrain" is heard when the aircraft descends through the 2,000-foot and 1,000-foot levels, and the word "minimum" is heard when the aircraft drops below a "decision height" selected by the pilot. Lastly, the word "glideslope" is out-putted in response to the detection of a glideslope deviation, the frequency of this announcement as well as its volume being a function of the magnitude of the deviation.