Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0

[Fred Wright]

On Fri, 22 Jul 2016, Gary E. Miller wrote:
> On Fri, 22 Jul 2016 15:11:37 -0700 (PDT)
> Fred Wright <address@hidden> wrote:
>
> > On Fri, 22 Jul 2016, Hal Murray wrote:
> > > address@hidden said:
> > > > Yeah, been there done that, not what I need.  I need to FORCE
> > > > what I need, not just hope for "usually".
> > >
> > > If you are working with LAT/LON, they have a known range.  You can
> > > convert to long/bignum with manual scaling.
> >
> > And note that long double is the same as double on ARM.
>
> Gack...  So much for standards.

Well, there is no real "standard" for long double, other than the C/C++
standards, which merely say that it's at least as good as a double and may
or may not be better.

But note that the circumference of the Earth is ~4E7m, or ~4E10mm, which
is still comfortable in the 52-bit mantissa of a double.

Fred Wright