[gps-talkusers] e: Re: a little frustrating
- From: Richard Bartholomew <richard_bartholomew@xxxxxxxxxxxxxxxx>
- To: gps-talkusers@xxxxxxxxxxxxx
- Date: Thu, 21 Apr 2005 23:07:25 +0100
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
>>>>--
>>>>No virus found in this outgoing message.
>>>>Checked by AVG Anti-Virus.
>>>>Version: 7.0.308 / Virus Database: 266.9.13 - Release Date: 4/16/2005
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