Question about number of channels

Hi

Just about to purchase a bluetooth gps receiver for my pda. Does it matter
how many
channels it has? There are models from 20 to 44 channels.

tia

peter

Maybe I'm missing something, but you can only 'see' about 10 satellites at a
time normally, so anything over 12 is arguably overkill! (So as long as your
channels are all on the correct frequency for the satellites, it shouldn't
matter. Are the receivers you're looking at designed to also pick ground
transmitters or even Gallileo?)

Chris

On Tue, 31 Jul 2007 17:26:57 GMT, "CJJ"


There are 31 satellites in orbit although not all are in active use at
the moment. So if you have unhindered horizon to horizon coverage you
should see 13, if you were at the top of a pealk and the works "slopes
away" on all sides you may see more.

In reality I've ovly ever had 8 sats detected.

44 is way overkill, more channels than there are satellites in the
sky, and galileo is so far off it's no even certain what it will use,
they only ratified the common signal between GPS and Gallileo on the
26th of July 2007 (a few days ago), and whilst it was projected to be
on line by 2008, it's now prediced to be 2012


http://www.navcen.uscg.gov/gps/default.htm

In an earlier contribution to this discussion,


My old Garmin GPS38 had used to manage quite happily with *one* channel -
with which it scanned round however many satellites were in view - although
it wasn't too good under tree cover.

You can never see more than 10 or 12 satellites at a time - so what's the
point of having more channels than that?
--
Cheers,
Roger
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although

Up a mountain in the Canaries, I had a lock on 14 satellites, but I agree
that there's really no difference between 20 or 24 channels - even five or
six satellites will give you a very accurate fix.

Marcus