GPS is used for weapon delivery, Mike so it must have a certain minimum level
of accuracy. But I’m making assumptions so I’ll have to research that part of
it.
Chris
> On 27 Apr 16, at 04:59, Mike Lazzari <watershed@xxxxxxxxxxxxxxx> wrote:
>
> A gps is much more accurate with lat/lon than with elevation. I'm going to
> guess that the absolute accuracy as stated by your phone is approximate and
> will change as you move around. Tree cover, buildings, canyon will make a big
> difference. This will change the relative accuracy of course. May be 30m at
> the bottom in the trees and 10m on top. With my handheld gps I can calibrate
> the gps altimeter with the barometer. Don't some/most new phones have a
> barometer? Might improve vertical accuracy. I find that if I stand still for
> a while the elevation bounces around and settles down to about 3-5ft +/-
> depending upon circumstances.
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