How do GPS tracking devices work?
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From: Jamie on 15 May 2010 11:50 Fester Bestertester wrote: > Specifically, how do they transmit if they are, for example, inside a > shipping container? > > Is there a hole drilled for an antenna? Or a fiberglas patch made to replace > some of the steel top or side? > > Thanks. > Your package does not have any thing put in it or on it that GPS systems detect, otherwise, it would be an expense.. The package is placed on the truck and logged in on the computer as to which truck it's on. They simply track the truck! Via Cell or dedicated system.. They simply scan in/out at the pickup/drop off places.. The scanner logs it to the current position location.
From: news on 15 May 2010 11:52 On Fri, 14 May 2010 22:40:31 -0700, Fester Bestertester <fbt(a)fbt.net> wrote: >Specifically, how do they transmit if they are, for example, inside a >shipping container? > >Is there a hole drilled for an antenna? Or a fiberglas patch made to replace >some of the steel top or side? > >Thanks. There are two types of GPS trackers: 1. Those that record their coordinates every X minutes and are retrieed and read to determine the data - what you put in a car to track a teenage driver. 2. Those that can either send data autonmously or be queried remotely. These usually have a large antenna dome - what you see on trucks/trailers carrying valuable loads. John
From: WarmUnderbelly on 15 May 2010 13:09 On Sat, 15 May 2010 06:47:13 -0600, hamilton <hamilton(a)nothere.com> wrote: >On 5/15/2010 3:41 AM, WarmUnderbelly wrote: >> On Fri, 14 May 2010 22:40:31 -0700, Fester Bestertester<fbt(a)fbt.net> >> wrote: >> >>> Specifically, how do they transmit if they are, for example, inside a >>> shipping container? >>> >>> Is there a hole drilled for an antenna? Or a fiberglas patch made to replace >>> some of the steel top or side? >>> >>> Thanks. >> >> >> They do not "transmit" at all. >GPS _receivers_ do not transmit. > >GPS _trackers_ may transmit. > >GPS Fleet Trackers do transmit, depends an which country on how they >transmit. Those are PERIPHERAL sub-systems to a GPS system. GPS receivers do not transmit. > >Some use cell phones, some use direct wireless transmitters. None of which make contact with any GPS hardware.
From: WarmUnderbelly on 15 May 2010 13:16 On Sat, 15 May 2010 11:50:24 -0400, Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote: >Fester Bestertester wrote: >> Specifically, how do they transmit if they are, for example, inside a >> shipping container? >> >> Is there a hole drilled for an antenna? Or a fiberglas patch made to replace >> some of the steel top or side? >> >> Thanks. >> >Your package does not have any thing put in it or on it that GPS systems >detect, otherwise, it would be an expense.. > The package is placed on the truck and logged in on the computer as >to which truck it's on. > They simply track the truck! Via Cell or dedicated system.. > > They simply scan in/out at the pickup/drop off places.. The scanner >logs it to the current position location. > > > Many also transmit several vehicle condition data blips as well, so they can track and prevent breakdowns, and catastrophic breakdowns being the most important to avoid. Still has nothing to do with GPS other than that GPS is referenced when the system records a new system status file and transmits it back to a central server, which makes vehicle tracking a no brainer. It can even fail to get a reading sometimes, and it would still have no effect on tracking as a new, good reading will soon follow.
From: hamilton on 15 May 2010 14:37
On 5/15/2010 11:09 AM, WarmUnderbelly wrote: > On Sat, 15 May 2010 06:47:13 -0600, hamilton<hamilton(a)nothere.com> > wrote: > >> On 5/15/2010 3:41 AM, WarmUnderbelly wrote: >>> On Fri, 14 May 2010 22:40:31 -0700, Fester Bestertester<fbt(a)fbt.net> >>> wrote: >>> >>>> Specifically, how do they transmit if they are, for example, inside a >>>> shipping container? >>>> >>>> Is there a hole drilled for an antenna? Or a fiberglas patch made to replace >>>> some of the steel top or side? >>>> >>>> Thanks. >>> >>> >>> They do not "transmit" at all. >> GPS _receivers_ do not transmit. >> >> GPS _trackers_ may transmit. >> >> GPS Fleet Trackers do transmit, depends an which country on how they >> transmit. > > Those are PERIPHERAL sub-systems to a GPS system. GPS receivers do not > transmit. >> >> Some use cell phones, some use direct wireless transmitters. > > None of which make contact with any GPS hardware. I think we are agreeing here. Glad to know I go it right. ;-) hamilton |