geohei,
you might want to read this earlier thread on pprune.org which covers the same topic in-depth.
http://www.pprune.org/forums/showthr...hreadid=166931
Note that the image in this thread shows a 737 classic EHSI which displays peaks mode min/max elevation in large font. On the NG, the same information is displayed in small font size in the lower left part of the ND (below the TERR text indicator). The principle, however, is the same.
EoD