Initial problems with GTM 12

xspartx · Regular Visitor Joined: Jan 13, 2004 Posts: 83

I have a 360 to which I have added a GTM12.

I have the latest firmware etc all updated today

GPS 2.90
GTM 4.20

The unit recognises the GTM 12 but I have no locks yet.

When I go a little deeper it appears I have "Subscriptions" to:

1. A 3 month Trial (presumably US)
2. Michelin (France)

I have looked onto the Garmin Website and entered my number and it wants to charge me $60 for subscription to Trafficmaster.

I had thought this was bundled with the GTM?

A couple of questions:

1. I presume I need to get the Trafficmaster enabled?
2. Is it really going to cost me more money?

Thanks in advance.

xspartx · Regular Visitor Joined: Jan 13, 2004 Posts: 83

Well the plot thickens.

I drove around today and it did find a channel and reported various traffic jams/slow traffic.

I then switched the unit off and it was lost............I didn't get it back.

Looks like dodgy reception.

Which is..........rubbish.

xspartx · Regular Visitor Joined: Jan 13, 2004 Posts: 83

Ok more testing.

I set it up in the house and left it.

After about an hour it seems to have locked onto something and is now receiving messages.

However, when I go onto the "Subscriptions" page, it still tells me that my subscription will be enabled later.????

stevei · Posted: Tue Jul 24, 2007 9:36 pm Post subject:

Try this... The GTM 12 is the same as the GTM 10

http://www.pocketgpsworld.com/modules.php?name=Forums&file=viewtopic&t=57434
_________________
Steve I

inspiredron · Posted: Wed Jul 25, 2007 9:52 pm Post subject:

xspartx · Regular Visitor Joined: Jan 13, 2004 Posts: 83

Right- further reports.

1. Firstly the location of the wire seems to make no difference. Accross the windscreen, scrunched up behind the unit, outside - all makes no difference to the reception.

2. reception seems to be "all or nothing" e.g. when the updates come in, they REALLY come in think and fast.

3. It normally takes 15 mins before any signal at all is received.

That said when it works, it does work quite well.

xspartx · Regular Visitor Joined: Jan 13, 2004 Posts: 83

One other thing, is there a way of checking that the unit is "receiving" without going back to the main menu and checking the GTM icon on there?

Seems a long winded way to check if a signal is being received.

rickwiggans · Lifetime Member Joined: Feb 09, 2006 Posts: 77

Where do you live? You won't get anything in the NW since the broadcasts have not been running since last December

xspartx · Regular Visitor Joined: Jan 13, 2004 Posts: 83

Yes, it seems very region dependent.

When I am in a region that broadcasts it finds signals almost instantly.

Then nothing.

adrian_anastas · Regular Visitor Joined: Mar 27, 2006 Posts: 73

Tim Buxton · Posted: Mon Aug 13, 2007 10:03 am Post subject:

xspartx · Regular Visitor Joined: Jan 13, 2004 Posts: 83

adrian_anastas · Regular Visitor Joined: Mar 27, 2006 Posts: 73

Dragracer1260 · Posted: Sun Aug 19, 2007 2:42 pm Post subject:

I have a GTM12 connected to a ZUMO that I use across London and out.

it works really well, even when plugged in indoors, picks up the first traffic info in about 1minute and seems to take about 3-5minutes before its received all its info.

One point though, my zumo has a option in tools to choose a set receiver frequency (of 2 I think) or for it to 'roam', i HAVE to let it roam as if I fix it to a frequency it doesn't pick up anthing at all.

Nick

simoh · Occasional Visitor Joined: Oct 09, 2007 Posts: 3

I've got the same combo (360 and GTM12) & live 10 mins from J6 on the M40. As you come from London, at the Stokenchurch pass (J6) you get a great view of the Thames valley and also a direct line of sight to Beckley mast transmitting Trafficmaster TMC on FoxFM. While in view of the aerial you'll get traffic info, but heading the other way, to London, once the Chiltern hills are behind you, nada.

I don't start getting traffic info again coming from J6 until around J2 of the M40. As I join the M25 anti-clock I'll get it for a while till J14-ish, then nothing until much further round towards the M23.

I think this is caused by 3 problems:

1. The string aerial/GTM12 isn't quite up to the job given the other 2 problems:
2. The RDS signal is transmitted at too low a signal strength.
3. The Trafficmaster TMC broadcast coverage isn't broad enough i.e. it needs to be transmitted on more stations.

The only one you can do anything about is 1; try to improve the performance of the unit itself. The others are up to government and commercial organisations.

Interested to hear from anyone who's managed to upgrade the GTM12's performance without resorting to external aerials.

Simoh

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