|
||
|
14th July 2016, 10:18 | #31 | |
This is my second home
Audi Q3 TDI S-Line Quattro Join Date: Jul 2007
Location: Clacton On Sea/On the boat somewhere
Posts: 51,272
Thanks: 9,890
Thanked 12,235 Times in 8,232 Posts
|
Quote:
As already said, the GPS system doesn't have any maps let alone traffic info! It is purely a system to allow products to get a grid location. Any maps, traffic info etc is a seperate product just using the GPS location system to overlay onto their maps. That's how it works, full stop, end of story
__________________
Jeff. |
|
14th July 2016, 12:06 | #32 |
Posted a thing or two
Wedgewood Connie SE / Black Club SE Join Date: Jan 2014
Location: Ballymoney
Posts: 1,459
Thanks: 542
Thanked 583 Times in 365 Posts
|
I seem to recall reading something ages (years) ago that it's possible to "deduce" congestion from the fact that a high number of satnav-equipped cars are all concentrated together and either stationary or moving very slowly along the same stretch of road. The only experience I have of using satnav is via the maps app on my phone, so I've no idea if this is true or nonsense!
__________________
My blood brother is an immigrant A beautiful immigrant My blood brother's Freddie Mercury A Nigerian mother of three |
14th July 2016, 15:08 | #33 |
I really should get out more.......
MG ZT-T 260 Join Date: Feb 2016
Location: Witney
Posts: 2,508
Thanks: 6
Thanked 910 Times in 571 Posts
|
The next time it does this I am going to take a picture of the screen.
It could be some time as I have no plans to go anywhere but local for the next months. |
16th July 2016, 11:40 | #34 | |
This is my second home
75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010
Location: Leeds
Posts: 17,273
Thanks: 2,160
Thanked 2,061 Times in 1,586 Posts
|
Quote:
A SatNav is just a receiver, a quite complex receiver, but still receive only. They cannot transmit back to the GPS satellites nor to other GPS receivers. The now switched off TMC(?) system, with which some 75's were equipped, was able to deduce congestion by the flow speed of vehicles on the road. You would get a congestion report on the dash, before becoming entangled, but that is really all it did.
__________________
Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money. Last edited by HarryM1BYT; 16th July 2016 at 11:51.. |
|
16th July 2016, 11:45 | #35 |
Avid contributor
Rover 75 Tourer CDTi Join Date: Nov 2006
Location: Bisley
Posts: 230
Thanks: 32
Thanked 42 Times in 40 Posts
|
But bear in mind what I believe Google do. They can track the position of Android phones, and when a large number of phones are all heading in the same detection, and all start to slow down it is probably the best source of real time traffic information there is.
So Google maps can certainly be updated by this, but its the phone location doing it - not the sat-nave as such. Mike |
19th July 2016, 07:04 | #36 |
Posted a thing or two
Mazda 6 Join Date: Dec 2013
Location: Wigan
Posts: 1,384
Thanks: 266
Thanked 398 Times in 287 Posts
|
It does/did indeed - and it used to be brilliant because you could have it set on your phone to 'traffic view' on your way to and from work on busy motorway commutes, it just showed colours relating to the speed of traffic rather than the full map and it was accurate enough to enable you to see probable gaps in queues in the inside lane at motorway exits so you could jump the queue........ then they made it 'better' and that feature disappeared
|
21st August 2016, 23:06 | #37 |
I really should get out more.......
MG ZT-T 260 Join Date: Feb 2016
Location: Witney
Posts: 2,508
Thanks: 6
Thanked 910 Times in 571 Posts
|
I am sure this is me not understanding the system but the unit today gave me some options to get around a traffic problem up ahead.
And here is the evidence. And a few mins later as I dismissed it the first time Last edited by SCP440; 21st August 2016 at 23:07.. Reason: Made a mistake |
21st August 2016, 23:11 | #38 |
I really should get out more.......
MG ZT-T 260 Join Date: Feb 2016
Location: Witney
Posts: 2,508
Thanks: 6
Thanked 910 Times in 571 Posts
|
So I ask the question again, how does it know this? I have never used that piece of road before in this car so there is no history, My mobile phone was not on wireless hot spot and the Bluetooth was not on. No coaches around so it was not getting any info from them or there free Wifi.
|
22nd August 2016, 08:40 | #39 |
Loves to post
75 CDTi Saloon Join Date: Jun 2010
Location: Bolton
Posts: 302
Thanks: 47
Thanked 77 Times in 49 Posts
|
If I were guessing, I'd suggest it's similar to Tomtom's IQ routes feature - the map has data of average traffic flows in the area embedded in it and knows that between time A and time B road C tends to be congested, and will suggest avoidance based on this historical knowledge - that it happens to map onto what's happening here and now for you is just a feature of the same thing having happened often at the same time on the same day on the same road in the past.
"It be half past three on the third monday of the month, 'appen be there be cows on the road as Farmer Jones moves fields at that time - best avoid that bit" basically. |
22nd August 2016, 09:19 | #40 | |
Posted a thing or two
Rover 75 Saloon & Tourer Join Date: Mar 2013
Location: Wilmslow
Posts: 1,531
Thanks: 433
Thanked 301 Times in 212 Posts
|
Quote:
|
|
Thread Tools | |
Display Modes | |
|
|