>
> 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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