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traffic info on Garmin Nuvi car satnav

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traffic info on Garmin Nuvi car satnav

Old 21st Sep 2021, 21:43
  #1 (permalink)  
Thread Starter
Join Date: Sep 2004
Location: Berkshire, UK
Posts: 752
traffic info on Garmin Nuvi car satnav

We have a Garmin Nuvi satnav for car use in the UK. It has free map updates and free traffic info for life. The map updates are down loaded from the internet and the traffic info is magically picked up off the airwaves as you motor around.

Apparently, the receiver for the traffic info is buried inside the cigar lighter plug adaptor that powers the satnav. Does anyone know how the info from the receiver gets from cigar plug adaptor into the satnav display unit?

I assumed that it was transmitted up to the display unit by some extra wires inside the power lead through the usb connector but this proved to be false, I know as I had to do a repair job on the cable after someone drove some distance with the cable hanging out of the car door making a bit of a mess of it. A careful dissection showed that the cable has only 2 cores. It may be that the signal is modulated onto the 5 volt power lines but it may also be by wireless means, maybe Bluetooth? Just curious, the repaired lead is a bit messy and I want to replace it either by cutting the cable of another cigar adaptor and splicing them together or it may be simpler than that, possibly just obtain a 5 volt adaptor without the traffic receiver to power the satnav plus the original adaptor without it's cable plugged in to another cigar socket to transmit the traffic info (if it does it by wireless).

rans6andrew is offline  
Old 21st Sep 2021, 23:06
  #2 (permalink)  
Join Date: Apr 2008
Location: Out in the sticks in DE56
Age: 83
Posts: 558
Use a Tomtom meself, but I'd guess they employ similar tech.
My understanding is that the receivers (satnav and traffic) are both in the body of the unit; one operating on a v.clever triangulation algorithm on 3 or more signals transmitted from satellites, t'other on a mobile telephone (gsm?) signal which does the traffic bit. Maybe the psu lead is used as an antenna for one of them, like the headphone lead in cellphones when picking up radio signals?
What I find especially astonishing is not just that so much tech can be contained in such a small box, but that the roads - at least the major ones - of a whole continent can be carried on a memory card of just a few gigabytes.
jimtherev is offline  
Old 22nd Sep 2021, 08:32
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Join Date: Dec 2007
Location: Westnoreastsouth
Posts: 1,467
On our varied collection of Garmin car satnavs the 'traffic info' gismo is actually the little square sided/oblong 'box' fitted to the power cable,similar to the cable in this pic.

I believe it picks up info via the car radio system.

longer ron is online now  
Old 23rd Sep 2021, 15:12
  #4 (permalink)  
Join Date: Apr 2007
Location: moraira,spain-Norfolk, UK
Age: 79
Posts: 381
My Satnav does get traffic information via the car radio. Unfortunately
everyone with similar technology gets re-routed to the same roads
when there is a traffic problem.
esa-aardvark is offline  
Old 23rd Sep 2021, 15:25
  #5 (permalink)  
Join Date: Feb 2016
Location: Southport
Posts: 1,240
My car (Renault Scenic) has a built in TomTom satnav, and is linked in to the radio/CD/bluetooth unit, apparently the traffic updates come over the radio signal (there's a little icon up top right to show it's receiving)....if you turn the stereo off the sat nav goes dead also (it can just be muted though).

It's very good at telling you about the jam you're already in.....the updates can be a bit slow to catch up with reality. For long journeys I've started usind Waze on my phone which updates a lot faster.
andytug is online now  

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