[Xastir] Line of sight

[Rob Campbell]

Hello,

I have used Xastir off and on for a few years now.  I haven't used the 
most recent versions yet, so I don't know what the new features are.  Is 
there currently any way to calculate line of sight when using 
topographic or DEM maps?  If not, how hard would it be to add this feature?

It's a little off topic, but are there any Linux programs that can do 
this?  I am currently using MapTech's Terrain Navigator Pro for this, 
but I would prefer using something on my Linux systems.

Thank you.

Rob Campbell
KG6HUM