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Old 05-24-2010, 01:58 PM   #1 (permalink)
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Anyone know where the spec for the 8900's GPS chip might be found? Most apps will tell you the radius precision, but none that I have seen will give you altitude precision (it strikes me as far less precise than the horizontal).


Additionally, has anyone heard of something like an external GPS antenna for the blackberry GPS?

I have yet to craft a useful Google query to find this data. Cell/GSM side and sales results keep getting in the way.

Thanks,

Woody
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Old 05-24-2010, 02:35 PM   #2 (permalink)
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Altitude is not the strong point of GPS and is only an approximation which is generally derived using GPS telemetry and the map database which you are using. Plus it is not corrected for pressure. I don't know if there is a true spec for it or not as pressure variations can not be predicted with much accuracy very far in advance.
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Old 05-27-2010, 09:11 AM   #3 (permalink)
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Quote:
Originally Posted by Dubdub View Post
Altitude is not the strong point of GPS and is only an approximation which is generally derived using GPS telemetry and the map database which you are using. Plus it is not corrected for pressure. I don't know if there is a true spec for it or not as pressure variations can not be predicted with much accuracy very far in advance.
I know very little about GPS, but I was under the impression that it allows calculation of your position relative to the center of the Earth's mass. That combined with a map or model of the Earth would be enough to figure out altitude above mean sea level, yes? I can see how barometric altimeters would depend on pressure, but not GPS.
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Old 05-27-2010, 11:42 AM   #4 (permalink)
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But GPS altitudes for the civilian user shouldn't be used as exact or even relied upon. Would probably be close enough for a one just wanting a ball park figure. I know you can use WAAS and refine it for aviation use though. Now if you are a military user with a military grade receiver, then all bets are off.
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