Re: [Paddlewise] GPS

From: Michael Daly <mikedaly_at_magma.ca>
Date: Sat, 28 Aug 2004 17:52:52 -0400
On 28 Aug 2004 at 13:39, alex wrote:

> GPS normally displays its range of precision, which depends on the
> number of satellites that can provide a good signal at given
> conditions, i.e. geographical position, obstructions etc.

You have to remember that the key word in EPE (estimated position 
error) is _estimated_.  The GPS receiver has no way of knowing what 
the error is so it only estimates it.  However, I frequently see my 
GPS showing an EPE of less that 15m.  Note that 15m is the error that 
you can expect without SA.  EPE is one thing on the GPS I choose to 
ignore unless it's significantly greater than 15m.

Mike

PS - Navigation is what you do with a sextant, timepiece and chart.  
Piloting is what you do with chart, compass and land references.
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Received on Sat Aug 28 2004 - 14:50:58 PDT

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