Hi, Mike
Is this configuration specific? The reason I ask is because, on a daily
basis, my sequence of actions seems to give different results! What I do
is:
1. Load up the GPS software whilst still inside a building.
2. Switch off the BN V6,1.
3. About 20 minutes later, once I've made one bus journey and I'm outside
waiting for the next, switch on the GPS receiver (it's a Magellan 310).
4. Once on my second bus, switch on the BN.
With this sequence, as soon as the BN is switched on, I get the "acquired
satellites" message. Therefore, it would seem that the GPS is looking for
and acquiring satellites independent of communication with the GPS
software.
Regards
Richard Bartholomew
----- Original Message -----
From: Michael May <MikeMay@xxxxxxxxxxxxxxxx
To: gps-talkusers@xxxxxxxxxxxxx
Date: Wed, 20 Apr 2005 12:39:56 -0700
Subject: [gps-talkusers] Re: a little frustrating
Robert,
The receiver does not start looking for satellites until the GPS
application menu is loaded.
Mike
At 06:43 AM 4/20/2005, you wrote:
Robert,
It is best to turn the blue logger on outside when ever possible, and
turn
it off when you are going into a building. It has to do with the memory
of
the unit and it's last fix of sattlites and when you have it on indoors
it
thinks you have had it off and traveled a long distance of miles like 2
or 3
hundred, so it goes through a entire new sat area look mode for it has no
updated sat. memory of the area.
hth
-----Original Message-----
From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Carter
Sent: Wednesday, April 20, 2005 06:11
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: a little frustrating
Hi,
I am using the pk and Blue Logger. Does the receiver start looking for
satellites when it is turned on or does it only start searching when the
gps software is started? I have been turning my receiver on inside using
my
light probe to make sure that it is on and then walking outside and
starting the gps software. Am I shooting myself in the foot in terms of
acquisition time by turning it on inside?
Thanks,
Robert Carter
At 11:34 AM 4/19/2005, you wrote:
Hello,
There are various reasons for your sluggish GPS receiver. Having to
wait
20 minutes for a fix is uncommon, so if this problem persists, please
call
Sendero tech support. Also, I am not sure if you tried turning the GPS
receiver on and off again once you were outside, sometimes that is all
it
takes.
Now for the possible culprits...
It is common for the GPS receiver to take a while when it is first
acquiring in a new location. It remembers your last location, so when
you
turn it on in the new location it is surprised by the different
latitudes
and longitudes. It will take a while to confirm that you have indeed
moved locations, it would rather give you no information than bad
information. The same goes for when it has been turned on indoors,
hasn't
been used in a while, or if the battery has recently run out of
juice. Here is a complete description of why this happens from Charles
LaPierre:
"The GPS receiver keeps an internal almanac of where the satellites
"should" be. This almanac is updated when the GPS receiver is linked to
the satellites."
"When the unit is first turned on it starts looking where it "thinks"
the
satellites should be based on its current almanac. If after a while it
can't find these satellites in the positions it thinks they should be
then
it switches to a mode called Cold start where it forgets its current
almanac and starts searching for all satellites. This happens because
as
far as the receiver is concerned the satellites should be in a
particular
position at a particular time for this particular part of the country
but
they aren't so the receiver starts over from scratch as if you just
moved
the receiver half way around the planet, and it rebuilds it almanac of
where the satellites are."
"Cold start or cold boot as they call it can take a while to obtain a
GPS
fix 5-10 minutes if you are lucky when out in an open area and the
satellites are in a favorable geometry."
Hope that helps,
Kim Casey
Sendero Group LLC
888.757.6810
At 05:13 PM 4/18/2005, you wrote:
Hi,
I went for a walk during lunch today and I walked for 20 minutes before
gps 3.0 on my Voice Note running Keysoft 5.1 got a fix on some
satellites.
Does anyone know why this might have taken so long to acquire a
satellite
fix?
I just did a Voice Note warm reboot and then a reinstall of gps 3.0.
I know I could upgrade to keysoft 6.x and gps 3.1 but I can't afford to
right now.
Anyway, can anyone tell me what the problem could have been? I was in
a
residential area with only a few trees and nowhere near tall buildings
and it was also a sunny day.
Thanks
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