egnos on garmin nuvi 255T

Hi all,


As of yesterday, I have a garmin nuvi 255T with -according the
information I find on the web- a sirfstar III chip and support for egnos.


However, when I look at the information from the satellite signals it
receives, I do not see any of the egnos satellites or any other
satellites with a satid above 32 for that matter.

Also, the precision of the signal is always above 10 meters.


So,
- does anybody know if the egnos-system is currently operational over
Europe.

- if this particular receiver does indeed support egnos

- if there is some advanced option I need to enter to enable egnos support?



Cheerio! Kr. Bonne.

t?


The user manual makes no mention of either WAAS or EGNOS.

https://buy.garmin.com/shop/store/manual.jsp?product=3D010-00717-20&cID=3D1=
37&pID=3D13428

A pair of entries on this forum assert that the Nuvi 255T does not
provide WAAS/EGNOS corrections:

http://forums.groundspeak.com/GC/index.php?showtopic=3D214582

http://forums.groundspeak.com/GC/index.php?showtopic=3D216184

Jack Yeazel provides a lot of information on WAAS and EGNOS here:

http://gpsinformation.net/exe/waas.html

Here's a list of EGNOS-aided receivers from ESA, and it doesn't list
any of the Nuvi series:

http://www.egnos-pro.esa.int/receivers.html

http://www.egnos-pro.esa.int/SBAS_receivers.pdf

You will probably do just fine without it.

Hi Pat,


pat_n_ed@yahoo.com schreef:

https://buy.garmin.com/shop/store/manual.jsp?product=010-00717-20&cID=137&pID=13428
(...)

Thanks.

So no luck, I guess. :-(


The reference to egnos-support was on a internet shop of GPSs. My guess
is they thought 'OK, it has a sirfstar III which can do egnos, so this
unit will probably support it too".




I know. GPS-receivers for in cars have a tendency to correct their own
position based on that fact that cars usually drive on roads, so if the
measurements say that the car is driving at 120 km/h in the mud just
next to the road, that's probably due to a measuements-error and the car
is in fact ON that road. :-)

(the same is true for the situation where the GPS says I am located 6
meter below the ground. Grin ... )


But it would be fun just to be able to play around with egnos a little bit.
Just enable it and disable it and see what difference in measurement it
gives.


Cheerio! Kr. Bonne.

os.
..

Maybe that the map is wrong, if that happens more than 1 time.
Anyway, if you can place the antenna in a better position or use an
external one the benefit would be much more that using Egnos.


6 meter of error? A very good precision for altitude estimation!

t.

Egnos? Basically no difference! (a very small difference, quite
difficult to measure. It' better for WAAS and MSAS as thos satellites
can be used for ranging also, but as far as I know EGNOS can't be used
for ranging)

Claude,

claudegps schreef:


Well, my car-gps is just there to help me get from point A to point B,
so that's good enough.




I never really understood this, why is measuring altitude more difficult
then on the horizontal plane?
Why are two of three of the dimensions more correct then the 3th one?




What exactly do you mean?

As far as I read about it, all 3 systems are all pretty much the same:
they provide information on effects in the athmosphere that can
influence the speed of the radio-signal from the satellite to the
receiver (and therefor the precision of the measurements).

What exactly do you mean by "ranging" ?



(this is one of the reason I prerefed the GPS to have EGNOS-support. At
least, it would give me something "real" to test instead of just
articles to read. ;-(


Cheerio! Kr. Bonne.