What sort of Altitude information is displayed on the Argus?
“MSL” or mean sea level is displayed in the lower left- hand corner of the screen and is labeled in the familiar sectional format. The large digits show the thousands of feet and the small digit shows the hundreds. Altitude information is obtained from sectional chart grid squares and the Argus is programmed to add 1000 feet to the charted figures. The MSL legend may appear in normal or reverse video. The display readings correspond to different meanings in each mode. The following table shows how the MSA number is computed in each: MODE-DISPLAY CHARACTERISTICS DEParture The MSL number represents the highest altitude (plus 1000 feet) of any sectional grid square displayed (even partially) on the screen in any given range. If MSL is in reverse video, it means that within 40 miles (the maximum screen range) there is at least part of a grid square whose number exceeds the number on screen by at least 1000 feet. ENRoute This MSL display in the ENRoute mode is similar to that in DEParture,
