The "selective availability" that reduced the accuracy of civilian GPS was
removed a fair while ago. Due to the use of many civilian units by the
military selective availability had to be turned off before large
operations which was a bit of a give away - so it was turned off
permanently. I recall this occurring as we were suddenly getting much more
accurate fixes on the equipment I was developing at the time.
Chris
On Tue, Apr 26, 2016 at 7:29 AM, Ken Norton <ken@xxxxxxxxxxx> wrote:
> If you are in a canyon or some place where you are getting visibility
> to not enough satellites, the accuracy will diminish a little.
> Otherwise, your assumption is correct that the vertical offset will
> remain the same.
>
> AG
>
> On Mon, Apr 25, 2016 at 11:41 PM, 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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>
>
>
> --
> Ken Norton
> ken@xxxxxxxxxxx
> http://www.zone-10.com
> --
> _________________________________________________________________
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