GTM25 vs GTM35

look on the Garmin site and compare the two?

When the original GTM25 that came with my 2597 started acting up with an intermittant power issue, I asked Garmin this question since GTM35's were plentiful on the internet. I wanted to make sure I could transfer my Total Traffic subscription to it.

Garmin advised the only real difference was the voltage level delivered to the Nuvi. As I recall, the GTM35 supplied a slightly -lower- voltage than the GTM25. Traffic receiver functions were exactly the same according to the tech I spoke with.

check this thread
http://www.poi-factory.com/node/32902

also see
http://www.gpscity.com/questions?qid=12576

The following is from the Garmin Factory Store. I could not find a GTM26 there

Technical Features for Garmin GTM™ 20 w/ Lifetime Traffic
(010-00544-13)
The Garmin 010-00544-13 is a GTM 20 cable with lifetime traffic updates. It is a real time service provider and does not charge any monthly fees or maintenance cost.

010-00544-13 Features:

GTM 20 Traffic Receiver
Portable FM-band Traffic Receiver, Antenna & Lighter Adapter
Receives Data From FM Broadcast Stations
Road Construction & Weather-Related Traffic Warnings
Proposes Alternate Routes
Plug-&-Play

For Garmin GPS Models:
aera: 550, 560
nuvi: 650, 660, 670, 680, 750, 755T, 760, 765T, 770, 775T, 780, 785T, 850, 855, 855T, 880, 885T, 5000
StreetPilot: c530, c550, c580
zumo: 450, 550, 660

**********************************

Technical Features for Garmin GTM™ 25 w/ Lifetime Traffic
(010-00722-13)
The Garmin 010-00722-13 is a GTM 25 cable with lifetime traffic updates. It is a real time service provider and does not charge any monthly fees or maintenance cost.

010-00722-13 Features:

GTM 25 w/ Traffic Receiver
Displays Local Traffic Tie-Ups & Current Traffic Levels
NAVTEQ Traffic Provides Real-Time Traffic Conditions for More Than 90 Metropolitan Markets in North America
Comprehensive, Reliable Nationwide Coverage
Accurate Traffic Flow Speeds
Plug-&-Play

For Garmin GPS Models:
nuvi: 205, 205W, 255, 255W, 265T, 265WT, 275T, 465T, 500, 550, 1200, 1250, 1260T, 1300, 1350, 1350T, 1370T, 1390T, 1450, 1490T
zumo: 220

The GTM 25 Traffic Receiver has many exciting features for users of all types. It's one of FactoryOutletStore's best selling Garmin Traffic Receivers. See the GTM 25 Traffic Receiver gallery images above for more product views. The GTM 25 Traffic Receiver is sold as a Brand New Unopened Item.

***************************************

Technical Features for Garmin GTM™ 35 Lifetime Traffic Receiver
(010-00896-13)
The Garmin 010-00896-13 is a GTM 35 cable with lifetime traffic updates. Using this data, your device alerts you to local traffic tie-ups and displays current traffic levels. The receiver also acts as an in-vehicle power charger.

010-00896-13 Features:

GTM 35 w/ Traffic Receiver
Provides Traffic Information
Alerts Local Traffic Tie-ups & Displays Current Traffic Levels
NAVTEQ Traffic Provides Real-Time Traffic Conditions
Comprehensive, Reliable Nationwide Coverage
Accurate Traffic Flow Speeds
Plug-&-Play

For Garmin GPS Models:
nuvi: 2200, 2250, 2250LT, 3750, 3760T, 3790T

Here is the reply from Garmin support. On the one hand there is no significant difference in performance, but then again there is.

"Thank you for contacting Garmin International.

There is no difference in appearance and no significant performance increase between the GTM 25, 35 and GTM 26, 36.

The GTM 26, 36 is our newest generation of traffic cable that has recently gone through an internal redesign to make it more efficient both cost and performance wise."

Notice "no significant performance increase" then later "redesign ... more efficient ... performance wise."

I read previous content where a user was able to find the traffic provider. Where is that data found on the GPS? There were two providers listed ... Clear Channel and Navteq.

BTW ... Those of us who live in western WA are happy to be basking in the sun after weeks of playing with a rubber ducky.

Good info contained in this thread.

The GTM25 and GTM35 that come with free traffic comes with a Navteq lifetime traffic subscription.
Clear Channel is an optional subscription that can be purchased. You can have both subscriptions active but the Nuvi will use the strongest signal available in your current location. It could be Navteq or Clear Channel.

To view your subscription, connect the Nuvi to your cigarette lighter socket and wait until the traffic icon appears. Now touch settings>traffic and your subscription information should appear.

Viewing the FM Table
Power your device on by connecting it to the GTM traffic cable
Touch View Map
Touch Speed
Touch and hold the middle of the MPH Speedometer
Touch Next until the Blue banner says either “FM Table, GTM Tables, GTM Info” *
You can now see how many stations are broadcasting in your current area and which provider.

If you want to reset the table
Touch Reset
Touch Yes
Touch Quit
Touch Back to return to the main menu
By resetting it may take a little while to update the traffic table.