"Marian Aldenhövel" wrote in message
...
Hi,

Use GPS_LOG WinCE.

I do.

It has it.

Can you enlighten me on on how the footprint is computed?

Just by looking in a few directions, determining the "points of impact" in
those directions and connecting them? Or is it more complicated?

It simply looks in 48 directions around the compass and computes the maximum
glide in each direction considering wind, polar, McCready, balast and bugs.
It terminates each glide at the 'safety altitude' you have selected. It
then connects these glide termination points with a line that forms a 48
sided polygon. It does this about once a minute.

Would a single mountain on a vast plane look like an island in the glide
footprint?

A single isolated mountain on a plain would be a "notch" in the polygon, not
an island. If you know the terrain, it's obvious that you can glide around
the mountain and land in the notch on the other side.

Bill Daniels