[gps-talkusers] e: Re: a little frustrating

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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