GPS - waas and satelite numbers

Author

waas and satelite numbers

Lowieke

2005-10-14, 5:48 pm

Hi,

When I turn my Garmin Venture gps to "waas enabled" I get satl 50 and
51, but I never get any signal on those satelites. Does anybody knows
what the problem is? Is also saw another Garmin and he had sat 30 and
34... What's the difference?

Kind regards,
Maarten

Sam Wormley

2005-10-14, 5:48 pm

Lowieke wrote:
> Hi,
>
> When I turn my Garmin Venture gps to "waas enabled" I get satl 50 and
> 51, but I never get any signal on those satelites. Does anybody knows
> what the problem is? Is also saw another Garmin and he had sat 30 and
> 34... What's the difference?
>
> Kind regards,
> Maarten

GPS Satellite PRN range from 1-31
IIRC PRN 32 is also used for something

WAAS - PRN 122 (Garmin 35) - Inmarsat 3F4 (AOR-W)
WAAS - PRN 134 (Garmin 47) - Inmarsat 3F3 (POR)

EGNOS - PRN 120 (Garmin 33) - Inmarsat 3F2 (AOR-E 15.5°W)
EGNOS - PRN 124 (Garmin 37) - Artemis (21.5°E)
EGNOS - PRN 126 (Garmin 39) - Inmarsat 3F5 (IOR-W/F5 25.0°E)
EGNOS - PRN 131 (Garmin 44) - Inmarsat 3F1 (IOR 64.0°E)

Lowieke

2005-10-15, 5:48 pm

Sam Wormley wrote:
> Lowieke wrote:
>
>
>
> GPS Satellite PRN range from 1-31
> IIRC PRN 32 is also used for something
>
> WAAS - PRN 122 (Garmin 35) - Inmarsat 3F4 (AOR-W)
> WAAS - PRN 134 (Garmin 47) - Inmarsat 3F3 (POR)
>
> EGNOS - PRN 120 (Garmin 33) - Inmarsat 3F2 (AOR-E 15.5°W)
> EGNOS - PRN 124 (Garmin 37) - Artemis (21.5°E)
> EGNOS - PRN 126 (Garmin 39) - Inmarsat 3F5 (IOR-W/F5 25.0°E)
> EGNOS - PRN 131 (Garmin 44) - Inmarsat 3F1 (IOR 64.0°E)

Thanks for the information! But why does my garmin tries to find sat 50
and 51? They are not in your list.

Kind regards,
Maarten

Sam Wormley

2005-10-15, 5:48 pm

Lowieke wrote:
> Sam Wormley wrote:
>
>
>
> Thanks for the information! But why does my garmin tries to find sat 50
> and 51? They are not in your list.
>
> Kind regards,
> Maarten

The following PRNs have been allocated to the MSAS system:
MTSAT-1 - PRN 129 (Garmin 42)
MTSAT-2 - PRN 137 (Garmin 50)

I'll see if I can find a more complete allocation list and
Post it.

Sam Wormley

2005-10-15, 5:48 pm

Lowieke wrote:
> Hi,
>
> When I turn my Garmin Venture gps to "waas enabled" I get satl 50 and
> 51, but I never get any signal on those satelites. Does anybody knows
> what the problem is? Is also saw another Garmin and he had sat 30 and
> 34... What's the difference?
>
> Kind regards,
> Maarten

Ref: http://www.unavco.org/facility/data/glossary.html

Inmarsat 3 F2, AOR-E 15.5°W PRN 120 EGNOS
Inmarsat 4 F2 53°W PRN 121
Inmarsat 3 F4, AOR-W 53.98°W PRN 122 WAAS
ESA Artemis 21.5°E PRN 124 EGNOS
Inmarsat 3 F5, IND-W 25°E PRN 126 EGNOS
Insat-NAV (tbd) PRN 127 GAGAN
Insat-NAV (tbd) PRN 128 GAGAN
MTSAT-1R (or MTSAT-2) 140°E PRN 129 MSAS
Inmarsat 4 F1 63°E PRN 130
Inmarsat 3 F1, IOR 64°E PRN 131 EGNOS
Inmarsat 4 F3 (n/a) PRN 133
Inmarsat 3 F3, POR 178.06°E PRN 134 WAAS
Inmarsat (reserved) 8°E PRN 136
MTSAT-2 (or MTSAT-1R) (tbd) PRN 137 MSAS

subtract 87 to get Garmin PRN numbers

Lowieke

2005-10-15, 5:48 pm

Sam Wormley wrote:
> Lowieke wrote:
>
>
>
> Ref: http://www.unavco.org/facility/data/glossary.html
>
> Inmarsat 3 F2, AOR-E 15.5°W PRN 120 EGNOS
> Inmarsat 4 F2 53°W PRN 121
> Inmarsat 3 F4, AOR-W 53.98°W PRN 122 WAAS
> ESA Artemis 21.5°E PRN 124 EGNOS
> Inmarsat 3 F5, IND-W 25°E PRN 126 EGNOS
> Insat-NAV (tbd) PRN 127 GAGAN
> Insat-NAV (tbd) PRN 128 GAGAN
> MTSAT-1R (or MTSAT-2) 140°E PRN 129 MSAS
> Inmarsat 4 F1 63°E PRN 130
> Inmarsat 3 F1, IOR 64°E PRN 131 EGNOS
> Inmarsat 4 F3 (n/a) PRN 133
> Inmarsat 3 F3, POR 178.06°E PRN 134 WAAS
> Inmarsat (reserved) 8°E PRN 136
> MTSAT-2 (or MTSAT-1R) (tbd) PRN 137 MSAS
>
> subtract 87 to get Garmin PRN numbers
Hi,

Thanks again, but I still have one question.
According to your list, my Garmin gps tries to find the MSAS system
which is for the Japanese region. I live in Europe. How can I force my
Garmin to search for the EGNOS sats?

Kind regards,
Maarten

El Castor

2005-10-15, 5:48 pm

Lowieke < Diepenbeek56@hotmail
.com> wrote:

>Sam Wormley wrote:
>Hi,
>
>Thanks again, but I still have one question.
>According to your list, my Garmin gps tries to find the MSAS system
>which is for the Japanese region. I live in Europe. How can I force my
>Garmin to search for the EGNOS sats?
>
I found the info from this page very helpful in registering the two
WAAS satellites visible from where I live in California. I don't know
if it's as applicable to your situation, but I expect it is.
http://www.gpsinformation.org/dale/dgps.htm#waas

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