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This is an old revision of this page, as edited by 101.165.107.222 (talk) at 10:03, 28 June 2016 (→Source for UERE table). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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Source for UERE table

In current version of page, there is a table called "Sources of User Equivalent Range Errors (UERE)" that is presented without reference. What is the source of this table? 198.123.51.133 (talk) 18:45, 16 February 2016 (UTC)[reply]

This section seems to contradict the GPS SPS Performance Specification referenced at the bottom of the article. Looking back through the edit history shows that the multiplier of 3 was applied to the estimated sigma values in late 2013. Although the contributor referenced a web page in support of this change, that reference doesn't seem to actually support the idea. Perhaps this was vandalism. It would be good if an expert could revisit this section, amending the error values if appropriate, and adding a reliable source in support of the presented data. 101.165.107.222 (talk) 10:03, 28 June 2016 (UTC)[reply]

Split-out

Folks, this article contains content copied from the Global Positioning System article. At the moment the content is mostly identical to part of that article. The intent, of course, is that this content in the main article should be summarized with a link added to this article. However, I don't want to make such a major change to the main article without giving interested parties an opportunity to discuss. --Mcorazao (talk) 02:58, 6 June 2010 (UTC)[reply]

Grewal (2001), p. 103

'Before it was turned off on May 1, 2000, typical SA errors were about 50 m (164 ft) horizontally and about 100 m (328 ft) vertically’ (‘Grewal (2001), p. 103’)

Looking at 'Global Positioning Systems, Inertial Navigation and Integration' by Mohinder S. Grewal, Lawrence R. Weill and Angus P. Andrews, 2001, p. 103 says:

'In the GPS SPS mode, the SA errors were specified to degrade navigation solution accuracy to 100m (2D RMS) horizontally and 156m (RMS) vertically.'

I can't find any reference to the 50m horizontal / 100m vertical that is quoted in the article. Does anyone know where these values come from? Is it a different Grewal (2001)? (How many Grewal (2001)s on GPS can there be?) I'm loath to change it without knowing where it came from, but the values just don't seem to be quoted correctly. --82.70.156.254 (talk) 13:09, 11 September 2011 (UTC)[reply]

Error bounds

Article says that civilian GPS accuracy is typically 15m or with the modern technology and under the clear sky is 5m. But what about in the typical city, when building reflections are in effect. I am sure there must be some data on what errors they may typically introduce. I for example find that at particular locations in the city systematic GPS error is 50-100 meters. Yurivict (talk) 02:03, 30 May 2012 (UTC)[reply]

Insert at top of article

An insert at the top of this article says, "This article is written like a personal reflection or essay rather than an encyclopedic description of the subject. Please help improve it by rewriting it in an encyclopedic style. (May 2012)". This is a rather vague comment which appears to have no clear meaning. I think neither the commenter nor anyone else has the vaguest idea what this jumble of words mean. Also the commenter shows his failure to understand the meaning of the phrase encyclopedic style. Encyclopedic doesn't refer to a style, it instead means comprehensive. The commenter, Khazar2, has not offered the slightest hint as to what he is talking about either on this Talk Page, his Talk Page or on his User Page. RHB100 (talk) 20:24, 16 January 2013 (UTC)[reply]

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