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North of 60

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#1 CdnRocketBoy


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Posted 24 April 2008 - 02:00 PM

Have any of you veterans tried the SkyScout or MySky devices in more Northern regions near the Canadian border or further north and if so, what were the results like? I'm usually just North of the border at 50 latitude (near Vancouver BC) but at times head to the boonies east of Alaska. Even at my home near the Washington State border my Sirius and XM-Satellite Radios drop out regulary due to the look angle of the geo-stationary satellites over the equater that are feeding them their data. I'm not sure if this is the case with GPS devices which I assume use orbiting satellites. Thanks,

#2 spoolies


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Posted 25 April 2008 - 06:48 AM

I am in Calgary and my SkyScout works perfectly. Even from the back deck of the house.

#3 CdnRocketBoy


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Posted 28 April 2008 - 02:41 PM

Thanks Spoolies,

I think I'll give it a go.


#4 Fish


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Posted 29 April 2008 - 11:23 AM

Good afternoon,

The GPS constellation has until recently consisted of 24 satellites in 6 orbital planes of about 55 degree inclination and RAANs about 60 degrees apart. This arrangement allows for visibility of at least 6 satellites from any point on the planet. An additional 7 satellites (31 in all) have been added to improve accuracy and redundancy.

Since GPS uses multiple satellites that are in relative motion to the Earth's surface (not geostationary) you should have no problem using it at high latitudes, although I have heard that accuracy is reduced above about 87 degrees. That's pretty far up there!

Geostationary satellites, which orbital mechanics requires to have an inclination of 0 degrees, cannot cover enough of the planet to be viable for GPS usage.

So feel free to go boony-bound and not get lost!


#5 Olivier Biot

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Posted 30 April 2008 - 01:32 PM

Is it possible that the decreased accuracy above +/-87° is connected to the transformation of (x, y, z) coordinates into polar (latitude, longitude) coordinates?

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