I'm guessing that the screens are resistive (pressure-based), and so
no multitouch. Which is ok, because multitouch is probably too complex
for your users anyway.
- Think simple actions; taps, mostly. If you do add in more complex
patterns (Slide to Scroll, for instance), be sure you add in a basic
way (tappable buttons) to accomplish the same thing.
- Beware of screen coverage. Make sure users' hands aren't covering
essential items when performing actions. Move menus to the bottom of
the screen, for instance.
- Keep touch targets large. On airplanes, you are dealing with a
really broad cross-section of humanity, so you might want to make the
touch targets even larger than you'd think (~1.25cm round). This of
course doesn't mean that the buttons themselves have to be that large,
but that the touchable area should be that large (what I call "iceberg
tips" in the book).
Hope that helps.
Dan
Dan Saffer
Designing Gestural Interfaces
O'Reilly, 3 December 2008
http://www.designinggesturalinterfaces.com
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