The way I have always understood it, Wayne, the "inaccuracy" of consumer
GPS compared to military is a fudge factor applied to the consumer signal.
If that is so, the inaccuracy would apply to all readings, so your starting
and ending altitudes would both be accurate within 15m. At worst, I guess,
if you start at 100m and end at 110m, consumer GPS could show you as having
descended!
But I will be happy to be educated more better!
Piers
On 26 Apr 2016 4:41 p.m., "wayne.harridge" <
wayne.harridge@xxxxxxxxxxxxxxxxxxx> wrote:
>
> Since I'm not sure where to find this info I thought I'd ask here first !
>
> I have a GPS tracking application on my iphone 6 (GPSTrack) which tells me
> the vertical and horizontal accuracy (typically this is 15m & 5m). I
> presume this is absolute accuracy but what I am interested is relative
> accuracy, e.g. If I walk up a hill recording Altitude at the bottom and
> top, how accurate will the difference in altitude be i.e. the distance I
> have travelled vertically ? Is the amount of inaccuracy consistent over
> time (in the same locatio) ?
>
> Thanks in advance,
>
> ...Wayne
>
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