Terrain on iPAQ glide computers

I've loaded terrain on my iPAQ Hx 4705 (using XCSoar), and find that
it makes it too hard for me to see much else on the screen when
flying, so I turn it off. I think a simpler map, just showing roads,
would be more useful.
Tuno, I was checking the developer forum on XCSoar and saw your
comment about the 'terrain' displayed around Parowan. I take that to
mean you fly with terrain on. How is your screen orientation set? I
find it difficult to discern the heading of my glider with terrain on,
but maybe I've got something set up wrong.
THX
Jim "Flies with Sheep" W.