[OSM-newbies] WAAS EGNOS MSAS SBAS (was New Garmin questions)

[Jeffrey Martin]

OK, I think I have it now. SBAS is differential GPS through a satellite
while
the term differential GPS by itself usually refers to ground signals so
SBAS is differential GPS but it's not differential GPS transmitted
from ground stations. MSAS should work in Korea.

On 8/10/07, Jeffrey Martin <dogshed at gmail.com> wrote:
>
> The wikipedia article says that MSAS is a SBAS like WAAS or EGNOS, but
> then it says
> it's differential GPS. Is SBAS similar enough that I should leave WAAS
> enabled?
>
> I suppose I can just try it with the option on and off and see what
> happens.
> I'm in South Korea right now.
>
> -Jeff
>
> On 8/10/07, Nick Black <nickblack1 at gmail.com> wrote:
> >
> > On 8/10/07, Jeffrey Martin <dogshed at gmail.com > wrote:
> > > I thought I read somewhere that sometimes using WAAS
> > > can actually decrease accuracy when the service is marginal.
> >
> >
> > WAAS is a correction service that only applies to North America.  If
> > you use WAAS outside of the area that its intended for it may lower
> > the accuracy of the unit, becuase it will be applying corrections for
> > the wrong area.
> >
> > EGNOS ( http://en.wikipedia.org/wiki/Egnos) is the EU version of WAAS -
> > so far as I know, if you enable WAAS on a Garmin unit in Europe, it
> > will use EGNOS - which will definitely enhance the accuracy of the
> > unit.
> >
> > So in conclusion - use WAAS/EGNOS in Europe and America.
> >
> > There's some quite useful informaiton on the ESA site:
> >
> > http://www.egnos-pro.esa.int/education/index.html
> >
> > >
> > > What happens if I set the track option to auto and most points?
> > >
> > >
> > >  On 8/10/07, Christoph Eckert <ce at christeck.de> wrote:
> > > > Hi Martin,
> > > >
> > > > > Do I want WAAS on or off?
> > > >
> > > > if you have good luck, enabling it leads to better precision.
> > > >
> > > > > I think the wiki said to set the track to time
> > > > > interval. Why not distance?
> > > >
> > > > If set to distance, you'll get less trackpoints at high speeds.
> > 1/sec
> > > > usually gives you the most trackpoints the device is capable of
> > > > generating.
> > > >
> > > > > If I set the track to store to the microSD card
> > > > > then should I have wrap when full or or off?
> > > >
> > > > It depends, but in most cases you want to have the most recent
> > > > trackpoints.
> > > >
> > > > > When it wraps does it wrap the data on the SD card also?
> > > >
> > > > No. The SD will always contain all trackpoints collected. The option
> > > > only affects the internal memory.
> > > >
> > > > > Which way is the best way to set the altimeter?
> > > > > Can I find a highway sign with the altitude and set it by hand?
> > > >
> > > > Sorry, I have no experience here.
> > > >
> > > > HTH & best regards,
> > > >
> > > > ce
> > > >
> > > >
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> > >
> > >
> > >
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> >
> >
> > --
> > Nick Black
> > --------------------------------
> > http://www.blacksworld.net
> >
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