[Loadstone] visible satellites

Kevin Chao kevinchao89 at gmail.com
Wed Jan 21 19:42:09 GMT 2009

I have seen a number of times where I have come across 13 satellites and I
am not sure if it is an accurate or inaccurate reading based on the GPS
program and/or GPS receiver. I have seen this in both using the Holux M-1000
(32 channels) and I-Blue 737A+ (66 channels) but never saw it when using the
Holux GPSlim236 (20 channels). 

-----Original Message-----
From: loadstone-bounces at loadstone-gps.com
[mailto:loadstone-bounces at loadstone-gps.com] On Behalf Of David W Wood
Sent: Wednesday, January 21, 2009 11:33 AM
To: loadstone at loadstone-gps.com
Subject: [Loadstone] visible satellites

Hi all:

A conundrum for the academics.

I have just returned from a much needed holiday in a location of
28.5N 16.5W approximately.
Otherwise known as Tenerife.

The number of visible satellites was frequently reported to be 9 or 10,
occasionally even 11 and 12.

On one occasion, 13.

On my return I have spoken with a friend who derived the algorithms for the
Surrey University satellites to explain why 13, but we cannot conclude why
this high number.

The usual explanation is 12 per hemisphere, but in reality I believe them to
be 8 in three 120 degree out of phase orbits.

Can anyone elucidate?

David W Wood


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