Hi,
I'am not quite sure this is the right forum to post my question, let me try
(I also found some specific gps forums)

I just bought a garmin gpsmap 76s mainly for use in a glider (hence the post
in the current forum)

I wonder if someone has some experience with such device for two points.

First point: I bought it because it has interesting feature such as glide
ratio and glide ratio to target. The latter is perfect, but I found the
glide ratio function difficult to use or at least difficult to take
advantage of. The calculation seems to be done on instant value without any
"smoothing", as a glider moves a lot the result can vary from very low value
to glide ratio higher than 500!! within a couple of seconds. Have you
experienced such behavior? Is this a user error? A bug?

Second point: to draw airspace zone it seems possible to use waypoints and
routes. Do you know other possibilities? Using a mapsource format compatible
for instance

Thanks in advance for your answers
Gilles