altitude

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zipzag
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Posts: 65
Joined: Wed Mar 03, 2004 7:34 am
Location: S.FL

altitude

Post by zipzag » Wed Mar 31, 2004 7:13 am

can altitude be added to tracking page?,also i notice that my altitude usually reads that i'm well below sea level?Also noticed that tracking circle is very accurate around town,but when on the beach last wkend it showed me about 1/4 mile offshore?

ATSupport
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Post by ATSupport » Wed Mar 31, 2004 9:56 am

Altitude will be added soon. Certain regions have negative alt, :shock:, if you believe it's an error, please provide the Lat/Long/Alt I will check.

Our overview maps do have big offsets in some areas. Until we have a better mapping service (free/low cost), please always refer to the MapQuest link for accuracy.
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zipzag
Junior Member
Posts: 65
Joined: Wed Mar 03, 2004 7:34 am
Location: S.FL

altitude

Post by zipzag » Wed Mar 31, 2004 2:03 pm

yes,know theres a error. Avg. altitude here in S.FL is 7'+- above MSL. My last fix showed a -570'. Im sure this is based upon MSL?

Skibum
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Post by Skibum » Wed Mar 31, 2004 2:09 pm

Must have been high tide....... :D

zipzag
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Location: S.FL

Post by zipzag » Wed Mar 31, 2004 2:21 pm

real high,new fix just put me @ +42',same location as my -570',thought i was getting dizzy. Those 600' altitude changes can really get to ya. :lol:

ATSupport
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Post by ATSupport » Wed Mar 31, 2004 4:10 pm

hmm...will get back.
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zipzag
Junior Member
Posts: 65
Joined: Wed Mar 03, 2004 7:34 am
Location: S.FL

Post by zipzag » Thu Apr 01, 2004 8:15 am

sitting @ home base this AM reading -111'.

zipzag
Junior Member
Posts: 65
Joined: Wed Mar 03, 2004 7:34 am
Location: S.FL

Post by zipzag » Sat Apr 10, 2004 9:52 am

Downloaded latest version today, Everytime i get new fix i get new altitude with it. Notice on gps that est. accur =91' wonder if that applies vertically also?

ATSupport
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Post by ATSupport » Sat Apr 10, 2004 10:45 am

I did some search on the net and found that's probably a common thing to almost all GPS chips, including the commerical product like Garmin. Check the link below for the tip:
Why is the altitude on my GPS incorrect by several hundred feet?

There mentioned a range of 15~100 meters, or up to 450 feet margin. :roll:

Q. Why is the altitude on my GPS incorrect by several hundred feet?
A. GARMIN GPS units have a potential position accuracy of 15 meters.

This is the same accuracy available in all commercially available GPS receivers.

The accuracy of the GPS units is not only dependent upon the GPS receiver design, but also by the U.S. DOD Selective Availability program (SA). Selective Availability, also known as SA, is a program that allows the U.S. DOD to degrade the accuracy of non-military GPS system by as much as +/- 100 meters. At the present time, the accuracy of all commercial GPS receivers can vary Between 15 to 100 meters depending on the level of degradation being imposed by the U.S. DOD.

Another factor that will effect the accuracy of the GPS receiver is the geometry of the satellites in view to the GPS receiver. A poor geometry situation can provide less accurate position readings, and this especially applies to GPS altitude measurements.

The altitude reading on the GPS unit can vary by +/- 450 ft. depending on the level of degradation being imposed under SA. It is not uncommon to see the altitude continuously drift up and down when SA is being imposed.
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zipzag
Junior Member
Posts: 65
Joined: Wed Mar 03, 2004 7:34 am
Location: S.FL

Post by zipzag » Sat Apr 10, 2004 11:05 am

understandable,but i got them beat with -570'

ATSupport
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Post by ATSupport » Sat Apr 10, 2004 11:19 am

:shock: hmm...that says something about the i730 GPS chip's altitude accuracy?
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zipzag
Junior Member
Posts: 65
Joined: Wed Mar 03, 2004 7:34 am
Location: S.FL

Post by zipzag » Sat Apr 10, 2004 11:21 am

Running the 88. DOD most likely doing their job.

Guest

Post by Guest » Tue Nov 09, 2004 4:13 pm

Skibum wrote:Must have been high tide....... :D
LMAO

SiLlY

Post by SiLlY » Tue Nov 09, 2004 4:15 pm

That was me ^^^^^ forgot to fill in name. Still funny 5 minutes later. LOL

king

Affirmation

Post by king » Wed Sep 07, 2005 9:57 am

This would be a fun addition, and we wouldn't mind the variances. They can be statistically factored out to some degree.

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