Estimated position error - Revision history

NiraD: link to singular

2008-10-17T11:25:50Z

link to singular

BigWhiteTruck: categorized

2005-11-30T22:31:40Z

categorized

BigWhiteTruck at 21:49, 30 November 2005

2005-11-30T21:49:51Z

New page

==Definition==
===EPE===
'''Estimated Position Error''' (also known as '''EPE''') is a [[GPS reciever]]'s estimate of it's own inaccuracy at the moment.

For example: When your [[GPSr]] tells you the EPE is 40 feet, what it is really saying is "I am pretty sure I know where we are. . . give or take 40 feet".

===HEPE===
Some [[GPS receivers]] will also display '''HEPE''' which stands for '''''H'''orizontal'' '''E'''stimated '''P'''osition '''E'''rror.
HEPE is an EPE without considering the inaccuracy of your altitude reading. Because of the inherent difficulty of calculating altitude with GPS, an HEPE is usually a smaller number than EPE. Since most geocaches are located on the earth's surface, your HEPE is more relevant to your search anyway.

*Note: Some GPS recievers do not display both. If your GPS only displays EPE, it is probably in reality an HEPE reading.

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 ===HEPE===
-Some [[GPS receivers]] will also display '''HEPE''' which stands for '''''H'''orizontal'' '''E'''stimated '''P'''osition '''E'''rror.
+Some [[GPS receiver]]s will also display '''HEPE''' which stands for '''''H'''orizontal'' '''E'''stimated '''P'''osition '''E'''rror.
 HEPE is an EPE without considering the inaccuracy of your altitude reading.  Because of the inherent difficulty of calculating altitude with GPS, an HEPE is usually a smaller number than EPE. Since most geocaches are located on the earth's surface, your HEPE is more relevant to your search anyway.
 *Note: Some GPS recievers do not display both.  If your GPS only displays EPE, it is probably in reality an HEPE reading.