"G.A. Seguin" wrote:

Could someone explain how to use the L/D feature,
in cruise, on my L-Nav. What should I do when it
show a L/D of 99...etc?
Thanks.
Gilles

It's not useful (IMHO). Use the "netto vario" function in cruise instead
(if available): the needle displays what the airmass in which you are
flying is actually doing at the very moment. In calm air it should read
zero. Many times you will find areas with positive or negative readings;
correct your heading by a few degrees and evaluate the results.. A few
cm/sec of rising airmass (not unusual in the late evening for example)
can make a huge difference to your glide.

Aldo Cernezzi
DG600