I also think it uses a bit of wifi triangulation as well. When you turn off wifi, you'll see that you get a message about location data may not be as accurate.
On 17/01/13 10:44, David Chittenden wrote: > It works primarily by receiving GPS satellite data. It uses cellular tower > triangulation as supplemental to enhance location information. The iPhone > performs these calculations and then presents the GPS coordinates to the GPS > location app which is being utilised. It must be noted that cellular tower > triangulation is not very accurate. Neither, for that matter, is GPS > satellite triangulation unless several satellite signals are received. > > David Chittenden, MSc, MRCAA > Email: dchitten...@gmail.com > Mobile: +64 21 2288 288 > Sent from my iPhone > > On 18/01/2013, at 5:03, "Kramlinger, Keith G., M.D." > <kramlinger.ke...@mayo.edu> wrote: > >> Does this work by GPS satellite data or by triangulating cell phone tower >> info? If the former, will GPS work in airplane mode? >> >> Keith >> >> -----Original Message----- >> From: viphone@googlegroups.com [mailto:viphone@googlegroups.com] On Behalf >> Of David Chittenden >> Sent: Thursday, January 17, 2013 1:51 AM >> To: viphone@googlegroups.com >> Subject: Re: Basic Questions on Navigon >> >> The iPhone has a built-in GPS receiver which works quite well. >> >> David Chittenden, MSc, MRCAA >> Email: dchitten...@gmail.com >> Mobile: +64 21 2288 288 >> Sent from my iPhone >> >> On 17/01/2013, at 19:52, "Bill Gallik" <wfgal...@charter.net> wrote: >> >>> Perhaps there is an URL with the information I'm looking for, but I still >>> want to be certain that I have answers to the following questions: >>> >>> 1) Does this app require an independent GPS receiver? >>> >>> 2) If so, is there a list of compatible such devices? >>> >>> 3) Can a user manual and/or user guide be found online? >>> >>> 4) If so, where? >>> >>> 5) What is the nature of technical support? >>> >>> 6) Is there additional cost for technical support if such exists? >>> >>> 7) Will this app function efficiently on an iPhone 5 with 32 Mb memory? >>> >>> Thanks >>> >>> ---------------- >>> Holland's Person, Bill >>> - "Having an understanding in our relationship does not mean you stand on a >>> pedestal giving me orders." >>> - Bill Gallik, January, 2013 >>> -- >>> You received this message because you are subscribed to the "VIPhone" >>> Google Group. >>> To search the VIPhone public archive, visit >>> http://www.mail-archive.com/viphone@googlegroups.com/. >>> To post to this group, send email to viphone@googlegroups.com. >>> To unsubscribe from this group, send email to >>> viphone+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/viphone?hl=en. >>> >>> >> >> -- >> You received this message because you are subscribed to the "VIPhone" Google >> Group. >> To search the VIPhone public archive, visit >> http://www.mail-archive.com/viphone@googlegroups.com/. >> To post to this group, send email to viphone@googlegroups.com. >> To unsubscribe from this group, send email to >> viphone+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/viphone?hl=en. >> >> >> -- >> You received this message because you are subscribed to the "VIPhone" Google >> Group. >> To search the VIPhone public archive, visit >> http://www.mail-archive.com/viphone@googlegroups.com/. >> To post to this group, send email to viphone@googlegroups.com. >> To unsubscribe from this group, send email to >> viphone+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/viphone?hl=en. >> >> > -- Christopher (CJ) chaltain at Gmail -- You received this message because you are subscribed to the "VIPhone" Google Group. To search the VIPhone public archive, visit http://www.mail-archive.com/viphone@googlegroups.com/. To post to this group, send email to viphone@googlegroups.com. To unsubscribe from this group, send email to viphone+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/viphone?hl=en.
