On Jun 8, 9:45*am, bildan wrote:
How about somebody writing an "inertial variometer" app for an i-Phone
4 since is has a built-in 6DOF IMU?

The thought (and a lot of other applications) crossed my mind while
watching the presentation.

I have no idea how much drift there is. Will have to experiment.

The accelerometer in all iPhones/iPod Touchs is good enough to give a
pretty accurate position still after integrating for 30 seconds or so
-- see the various car quarter mile timing apps out there, which match
up well against expensive purpose-built equipment.