Waas In Uk

[Cache Bandicoots]

Hi

 

I've just got a new ETrex Legend and have managed to get a lock on WAAS 33. I think I should also be able to see 44 & maybe 35. What was satellites have other folks in UK (London-ish) managed to get a lock on?

 

Many thanks

[+The Blorenges]

There's loads of threads in the forum on this. Do a search for EGNOS or WAAS - Egnos is the European version of WAAS. But to help, here are the satellites available. The last number (33, 35, 37 etc) is the Garmin number.

In the UK you should be able to get Inmarsat 3 F2 (33) which is over the Atlantic to the west of Africa;

Artemis (37) which is the European satellite - over the West coast of Africa; Inmarsat IOW-W (39) Indian Ocean but that is low on the horizon for the UK and Inmarsat 3 F1 (44) Indian Ocean. I have an idea either 39 or 44 is not available now. The other number shown (120, 122, 131 etc) is the compass bearing where the satellite appears to the UK.

 

INMARSAT 3 F2 (AOR-E) (Atlantic Ocean Region East) Western Africa 120 33

INMARSAT 3 F4 (AOR-W) (Atlantic Ocean Region West) East coast of Brasil 122 35

INMARSAT 3 F1 (IOR) (Indian Ocean Region) Indian Ocean 131 44

INMARSAT 3 F3 (POR) (Pacific Ocean Region) Pacific 134 47

INMARSAT IOR-W (III-F5) (Indian Ocean Region West) Africa (Kongo) 126 39

Artemis Africa (Kongo) 124 37

 

Hope this helps!

Chris

[+Roving Rangies]

My husband see's many after I have hit him over the head after returning back late from the pub!

[JackiePenn]

The other number shown (120, 122, 131 etc) is the compass bearing where the satellite appears to the UK.

 

?

 

nah it is not a bearing.

 

It is actually the PRN number (unique ‘Pseudo Random Noise’ code), it is equivalent to the Space Vehicle Identification (SV ID) number of the satellite.

 

Subtract 87 from the PRN number you get the ID numbers garmin use .

 

e.g

 

120 - 87 = 33

 

PRN 120 = GARMIN 33

[alistair_uk]

My husband see's many after I have hit him over the head after returning back late from the pub!

 

I see many just returning from the pub.

 

nah it is not a bearing.

 

It is actually the PRN number (unique ‘Pseudo Random Noise’ code), it is equivalent to the Space Vehicle Identification (SV ID) number of the satellite.

 

Subtract 87 from the PRN number you get the ID numbers garmin use .

 

e.g

 

120 - 87 = 33

 

PRN 120 = GARMIN 33

 

Now that is interesting, well I found it interesting. Just before i get my coat and go seeking a life (stopping of to find a plastic box on the way) can I ask what the relevance of the 87 is. Is it as basic as the first GPS satellite is 87 and the rest are sequential?

[JackiePenn]

can I ask what the relevance of the 87 is.

 

No idea on the 87 myself, not researched it. Non WAAS birds as far as I recall have been double digits todate, so I had assumed that Garmin had issues where it foreseen a requirement that WAAS/EGNOS bird ID's had to remain in double digits instead of using the 'proper' 3 digits PRN numbers. Software or hardware issues *guess*.

[+wildlifewriter]

No idea on the 87 myself, not researched it. Non WAAS birds as far as I recall have been double digits todate, so I had assumed that Garmin had issues where it foreseen a requirement that WAAS/EGNOS bird ID's had to remain in double digits instead of using the 'proper' 3 digits PRN numbers. Software or hardware issues *guess*.

It's the correct answer.

 

If Garmin had known how the PRN assignments would work out *today*, they'd probably have chosen -59 instead of -87.

 

This isn't likely to be a real problem any time soon, and firmware updates all round would probably solve it anyway.

 

-Wlw