On 17 May 2008, at 22:17, Philippe Guillebert wrote:
Matthias Schulze wrote:
I am wondering about applications possible with the Freerunner
(connected via usb) or later phone models, if a barometric altimeter
would be included.
Hi,
Err, doesn't GPS give us a pretty accurate altitude already ?
lol.
No.
Event if the precision is something like +/- 20 meters, I believe
it's got a better accuracy than a barometric altimeter that you've
got to calibrate to the meteorological conditions all the time.
GPS altitude precision is more like +/- 200 metres. Even cheap
electronic altimeters are accurate to a few feet. That they need
daily calibration makes them only of use to people who actually
_need_ to know their height - an altimeter built into a digital
watch, for instance, is usually no more than a gimmick, but a hang-
glider pilot can simply hold down the "zero" button on his £100
altimeter for 3 seconds and then knows his height accurately for the
duration of the day's flying.
Stroller.
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