Doug,
I don't have much time flying with it and no IR time at all but I have
played around with the terrain feature. You can display aviation data
on the terrain page but you can't display any of the data fields.
Since the data fields I use are duplicated on the sandel 3308, I can
leave the unit in terrain mode. Terrain mode also offers a limited
field of view, 120 degrees, which is nice. Have you downloaded the
latest simulator from Garmin? If not, give it a test drive. I think
you'll like it.

I don't think you can wrong by upgrading. Good luck.
Dave
M35

Doug Vetter wrote:

My original concern was that the terrain warning logic would be too
"chatty" and distracting, but from a brief overview of the pilot's guide
it almost seems that the opposite is true. The PDA logic graph shows
that the unit will let you be as low as 350 AGL five miles away from the
airport before it gripes. Little scary if you ask me.